| AFP | Alpha(¥á) Feto-Protein [HP 1826, 1858, 1859, 2265] ; Oncofetal Antigens &nbs... |
|---|---|
| SF | Sabin-Feldman [test]; safety factor; salt-free; scarlet fever; screen film; seminal fluid; serosal f... |
| AF | abnormal frequency; acid-fast; adult female; afebrile; aflatoxin; albumin-free; albumose-free; aldeh... |
| CF | calcaneal fibular [ligament]; calcium leucovorin; calf blood flow; calibration factor; cancer-free; ... |
| FF | degree of fineness of abrasive particles; fat-free; father factor; fecal frequency; fertility factor... |
| PC20 | provocative concentration causing 20% fall in FEV1 |
|---|---|
| Free T | free testosterone |
| Free T4 | free thyroxine |
| AFB | Acetate free biofiltration |
| AFR | Ascorbate free radical |
| fall | 1. To Descend, either suddenly or gradually; particularly, to descend by the force of gravity; to drop; to sink; as, the apple falls; the tide falls; the mercury falls in the barometer. "I beheld Satan as lightning fall from heaven." (Luke x. 18) 2. To cease to be erect; to take suddenly a recumbent posture; to become prostrate; to drop; as, a child totters and falls; a tree falls; a worshiper falls on his knees. "I fell at his feet to worship him." (Rev. Xix. 10) 3. To find a final outlet; to discharge its waters; to empty; with into; as, the river Rhone falls into the Mediterranean. 4. To become prostrate and dead; to die; especially, to die by violence, as in battle. "A thousand shall fall at thy side." (Ps. Xci. 7) "He rushed into the field, and, foremost fighting, fell." (Byron) 5. To cease to be active or strong; to die away; to lose strength; to subside; to become less intense; as, the wind falls. 6. To issue forth into life; to be brought forth; said of the young of certain animals. 7. To decline in power, glory, wealth, or importance; to become insignificant; to lose rank or position; to decline in weight, value, price etc.; to become less; as, the falls; stocks fell two points. "I am a poor falle man, unworthy now To be thy lord and master." (Shak) "The greatness of these Irish lords suddenly fell and vanished." (Sir J. Davies) 8. To be overthrown or captured; to be destroyed. "Heaven and earth will witness, if Rome must fall, that we are innocent." (Addison) 9. To descend in character or reputation; to become degraded; to sink into vice, error, or sin; to depart from the faith; to apostatize; to sin. "Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief." (Heb. Iv. 11) 10. To become insnared or embarrassed; to be entrapped; to be worse off than before; asm to fall into error; to fall into difficulties. 11. To assume a look of shame or disappointment; to become or appear dejected; said of the countenance. "Cain was very wroth, and his countenance fell." (Gen. Iv. 5) "I have observed of late thy looks are fallen." (Addison) 12. To sink; to languish; to become feeble or faint; as, our spirits rise and fall with our fortunes. 13. To pass somewha suddenly, and passively, into a new state of body or mind; to become; as, to fall asleep; to fall into a passion; to fall in love; to fall into temptation. 14. To happen; to to come to pass; to light; to befall; to issue; to terminate. "The Romans fell on this model by chance." (Swift) "Sit still, my daughter, until thou know how the matter will fall." (Ruth. Iii. 18) "They do not make laws, they fall into customs." (H. Spencer) 15. To come; to occur; to arrive. "The vernal equinox, which at the Nicene Council fell on the 21st of March, falls now [1694] about ten days sooner." (Holder) 16. To begin with haste, ardor, or vehemence; to rush or hurry; as, they fell to blows. "They now no longer doubted, but fell to work heart and soul." (Jowett (Thucyd)) 17. To pass or be transferred by chance, lot, distribution, inheritance, or otherwise; as, the estate fell to his brother; the kingdom fell into the hands of his rivals. 18. To belong or appertain. "If to her share some female errors fall, Look on her face, and you'll forget them all." (Pope) 19. To be dropped or uttered carelessly; as, an unguarded expression fell from his lips; not a murmur fell from him. To fall abroad of To meet, as a ship; also, to discover or come near, as land. To concur with; to agree with; as, the measure falls in with popular opinion. To comply; to yield to. "You will find it difficult to persuade learned men to fall in with your projects." . To fall off. To drop; as, fruits fall off when ripe. To withdraw; to separate; to become detached; as, friends fall off in adversity. "Love cools, friendship falls off, brothers divide." . To perish; to die away; as, words fall off by disuse. To apostatize; to forsake; to withdraw from the faith, or from allegiance or duty. "Those captive tribes . . . Fell off From God to worship calves." (Milton) To forsake; to abandon; as, his customers fell off. To depreciate; to change for the worse; to deteriorate; to become less valuable, abundant, or interesting; as, a falling off in the wheat crop; the magazine or the review falls off. "O Hamlet, what a falling off was there!" . To deviate or trend to the leeward of the point to which the head of the ship was before directed; to fall to leeward. To fall on. To meet with; to light upon; as, we have fallen on evil days. To begin suddenly and eagerly. "Fall on, and try the appetite to eat." . To begin an attack; to assault; to assail. "Fall on, fall on, and hear him not." . To drop on; to descend on. To fall out. To quarrel; to begin to contend. "A soul exasperated in ills falls out With everything, its friend, itself." (Addison) To happen; to befall; to chance. "There fell out a bloody quarrel betwixt the frogs and the mice." . To leave the ranks, as a soldier. To fall over. To revolt; to desert from one side to another. To fall beyond. To fall short, to be deficient; as, the corn falls short; they all fall short in duty. To fall through, to come to nothing; to fail; as, the engageent has fallen through. To fall to, to begin. "Fall to, with eager joy, on homely food." . To fall under. To come under, or within the limits of; to be subjected to; as, they fell under the jurisdiction of the emperor. To come under; to become the subject of; as, this point did not fall under the cognizance or deliberations of the court; these things do not fall under human sight or observation. To come within; to be ranged or reckoned with; to be subordinate to in the way of classification; as, these substances fall under a different class or order. To fall upon. To attack. [See To fall on] To attempt; to have recourse to. "I do not intend to fall upon nice disquisitions." Fall primarily denotes descending motion, either in a perpendicular or inclined direction, and, in most of its applications, implies, literally or figuratively, velocity, haste, suddenness, or violence. Its use is so various, and so mush diversified by modifying words, that it is not easy to enumerate its senses in all its applications. Origin: AS. Feallan; akin to D. Vallen, OS. & OHG. Fallan, G. Fallen, Icel. Falla, Sw. Falla, Dan. Falde, Lith. Pulti, L. Fallere to deceive, Gr. Sfallein to cause to fall, Skr. Sphal, sphul, to tremble. Cf. Fail, Fell, to cause to fall. 1. To let fall; to drop. "For every tear he falls, a Trojan bleeds." (Shak) 2. To sink; to depress; as, to fall the voice. 3. To diminish; to lessen or lower. "Upon lessening interest to four per cent, you fall the price of your native commodities." (Locke) 4. To bring forth; as, to fall lambs. 5. To fell; to cut down; as, to fall a tree. 1. The act of falling; a dropping or descending be the force of gravity; descent; as, a fall from a horse, or from the yard of ship. 2. The act of dropping or tumbling from an erect posture; as, he was walking on ice, and had a fall. 3. Death; destruction; overthrow; ruin. "They thy fall conspire." (Denham) "Pride goeth before destruction, and a haughty spirit before a fall." (Prov. Xvi. 18) 4. Downfall; degradation; loss of greatness or office; termination of greatness, power, or dominion; ruin; overthrow; as, the fall of the Roman empire. "Beholds thee glorious only in thy fall." (Pope) 5. The surrender of a besieged fortress or town; as, the fall of Sebastopol. 6. Diminution or decrease in price or value; depreciation; as, the fall of prices; the fall of rents. 7. A sinking of tone; cadence; as, the fall of the voice at the close of a sentence. 8. Declivity; the descent of land or a hill; a slope. 9. Descent of water; a cascade; a cataract; a rush of water down a precipice or steep; usually in the plural, sometimes in the singular; as, the falls of Niagara. 10. The discharge of a river or current of water into the ocean, or into a lake or pond; as, the fall of the Po into the Gulf of Venice. 11. Extent of descent; the distance which anything falls; as, the water of a stream has a fall of five feet. 12. The season when leaves fall from trees; autumn. "What crowds of patients the town doctor kills, Or how, last fall, he raised the weekly bills." (Dryden) 13. That which falls; a falling; as, a fall of rain; a heavy fall of snow. 14. The act of felling or cutting down. "The fall of timber." . 15. Lapse or declinsion from innocence or goodness. Specifically: The first apostasy; the act of our first parents in eating the forbidden fruit; also, the apostasy of the rebellious angels. 16. Formerly, a kind of ruff or band for the neck; a falling band; a faule. 17. That part (as one of the ropes) of a tackle to which the power is applied in hoisting. <zoology> Fall herring, a herring of the Atlantic (Clupea mediocris); also called tailor herring, and hickory shad. To try a fall, to try a bout at wrestling. Source: Websters Dictionary (01 Mar 1998) |
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| fall-run fish | <marine biology> Anadromous fish that return to fresh water in the fall and spawn during fall or early winter. (09 Oct 1997) |
| bacteria-free stage of bacterial endocarditis | Endocarditis described prior to the antibiotic era and presumably due to spontaneous healing of the bacterial vegetations. (05 Mar 2000) |
| carbon dioxide-free water | Purified water that has been boiled vigorously for 5 minutes or more. (05 Mar 2000) |
| radical, free | In biochemistry, it is a group of atoms bonded together into an entity that is extremely reactive and shortlived. (a free radical is not a political extremist on parole.) (12 Dec 1998) |
| germ-free animal | An animal which has no microorganisms whatsoever living in or on it. An animal which was born and raised in an isolated environment with no microorganisms in it, such as within a germ-free isolator. (09 Oct 1997) |
| germ-free isolator | A chamber which has absolutely no microorganisms whatsoever living in it, where a germ-free animal can be born and raised. An artificial barrier surrounding a living facility for germ-free animals, which keeps out all microorganisms. (09 Oct 1997) |
| germ-free life | Animals not contaminated by or associated with any foreign organisms. (12 Dec 1998) |
| carrier-free | A substance in which a radioactive or other tagged atom is found in every molecule; the highest possible specific activity. (05 Mar 2000) |
| gibbs free energy | The total amount of energy which is either used up or released during a chemical reaction. Gibbs free energy (delta G) = (delta H) - t (delta s): where (delta H) is the change in enthalpy, calculated by adding up the amount of energy released or used up to break or form chemical bonds during the reaction, t is the temperature at which the reaction took place, and (delta S) is the change in entropy, or amount of disorder, that occurs in the molecules involved during the reaction. (09 Oct 1997) |
| mean free path | <radiobiology> Average distance a particle travels between occurrences of the given event, for example, between collisions. For collisions, the mean free path is roughly equal to unity divided by the product of the collision cross-section times the particle density. (09 Oct 1997) |
| cell-free extract | <cell culture> A liquid that is a mixture of the contents of a particular type of cell, sometimes the organelles are also filtered out of the liquid. (26 Mar 1998) |
| cell-free protein synthesis | <technique> An in vitro method to make proteins, using amino acids, the mRNA corresponding to the protein to be made, and a cell-free extract (the contents of a cell after removal of the cell wall and/or outer cell membranes) for other needed components and enzymes. (26 Mar 1998) |
| cell-free system | <cell culture, molecular biology> Any system in which a normal cellular reaction is reconstituted in the absence of cells for example in vitro translation systems that will synthesise protein from mRNA using a lysate of rabbit reticulocytes or wheat germ. A fractionated cell extract that maintains a biological function. A subcellular fraction isolated by ultracentrifugation or other separation techniques must first be isolated so that a process can be studied free from all of the complex side reactions that occur in a cell. The cell-free system is therefore widely used in cell biology. (12 Dec 1998) |
| gluten-free diet | Elimination of all wheat, rye, barley, and oat gluten from the diet; treatment for gluten-sensitive enteropathy (coeliac disease). See: coeliac disease. (05 Mar 2000) |
| free fall | a sudden sharp decrease in some quantity |
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| free fall | the ideal falling motion of something subject only to a gravitational field |
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