| BFPR | biologic false-positive reaction |
|---|---|
| BFPSTS | biologic false-positive serological test for syphilis |
| BFR | biologic false reaction; blood flow rate; bone formation rate; buffered Ringer [solution] |
| CFP | chronic false positive; Clinical Fellowship Program; cyclophosphamide, fluorouracil, prednisone; cys... |
| FA | false aneurysm; Families Anonymous; Fanconi anemia; far advanced; fatty acid; febrile antigen; femor... |
| Fischer projection formula | <biochemistry> Of sugars, representations, by projection, of cyclic sugars, or derivatives thereof, in which the carbon chain is depicted vertically. The lowest-numbered asymmetric carbon atom (C-1 in aldoses; C-2 in 2-ketoses, e.g., fructose) is drawn at the top, and the rest of the carbon atoms of the chain are drawn in sequence below the top carbon atom. For each carbon atom, depicted in projection as lying in the plane of the paper, the carbon-to-carbon bond(s), which actually point away from the viewer, are drawn as vertical lines. The left-hand and right-hand bonds of each carbon atom, which actually point toward the viewer, are, in projection, depicted as horizontal lines. The conventions for the Fischer formulas of cyclic sugars are as follows: 1) if the highest-numbered asymmetric carbon atom has its OH (or its replacement) lying to the right, as is the 2-OH of d-glyceraldehyde, the sugar has the d configuration; if the OH is to the left, the sugar has the l configuration. 2) On the anomeric carbon atom (C-1 in the aldoses; C-2 in the 2-ketoses), an OH or substituted OH that lies to the right, with the OH of the highest-numbered asymmetric carbon atom also to the right is defined to be a; if it is to the left, with the OH of the highest-numbered carbon atom still to the right, it is b; the reverse applies if the latter OH is to the left. 3) The orientation of a terminal CH2OH group in the aldoses carries no configurational significance, as it contains no asymmetric carbon atom. (05 Mar 2000) |
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| lateral projection | Radiographic projection with the X-ray beam in a coronal plane. (05 Mar 2000) |
| frog-leg lateral projection | A lateral projection of the femoral neck made with the thigh maximally abducted. (05 Mar 2000) |
| aneurysm, false | An aneurysm in which the entire wall is injured and the blood is contained by the surrounding tissues, with eventual formation of a sac communicating with the artery or heart. (12 Dec 1998) |
| positive, false | A result that is erroneously positive when a situation is normal. An example of a false positive: a particular test designed to detect cancer of the toenail is positive but the person does not have toenail cancer. (12 Dec 1998) |
| negative, false | A result that appears negative but fails to reveal a situation. An example of a false negative: a particular test designed to detect cancer of the toenail is negative but the person has toenail cancer. (12 Dec 1998) |
| false | 1. Uttering falsehood; unveracious; given to deceit; dishnest; as, a false witness. 2. Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous; perfidious; as, a false friend, lover, or subject; false to promises. "I to myself was false, ere thou to me." (Milton) 3. Not according with truth or reality; not true; fitted or likely to deceive or disappoint; as, a false statement. 4. Not genuine or real; assumed or designed to deceive; counterfeit; hypocritical; as, false tears; false modesty; false colours; false jewelry. "False face must hide what the false heart doth know." (Shak) 5. Not well founded; not firm or trustworthy; erroneous; as, a false claim; a false conclusion; a false construction in grammar. "Whose false foundation waves have swept away." (Spenser) 6. Not essential or permanent, as parts of a structure which are temporary or supplemental. 7. Not in tune. False arch, construction works to facilitate the erection of the main work, as scaffolding, bridge centering, etc. Origin: L. Falsus, p.p. Of fallere to deceive; cf. OF. Faus, fals, F. Faux, and AS. Fals fraud. See Fail, Fall. Source: Websters Dictionary (01 Mar 1998) |
| false agglutination | 1. Agglomeration of particles in solution which does not involve antigen-antibody combination. Synonym: false agglutination. Synonym: rouleaux formation. (05 Mar 2000) |
| false albuminuria | Albuminuria resulting from the presence of blood escaping somewhere in the urinary tract, of chyle, or of some other albuminous fluid, not caused by filtration of albumin from the blood through the kidneys. Synonym: false albuminuria. (05 Mar 2000) |
| false anaemia | Pallor of the skin and mucous membranes without the blood changes of anaemia. Synonym: false anaemia. (05 Mar 2000) |
| false aneurysm | <surgery> Pulsating, encapsulated haematoma in communication with the lumen of a ruptured vessel, ventricular pseudoaneurysm, a cardiac rupture contained and loculated by pericardium, which forms its external wall. An aneurysm whose walls consist of adventitia and periarterial fibrous tissue and haematoma. (05 Mar 2000) |
| false angina | <symptom> Angina-like sensation in absence of myocardial ischemia. (05 Mar 2000) |
| false ankylosis | Stiffening of a joint due to the presence of fibrous bands between and about the bones forming the joint. Synonym: false ankylosis, pseudankylosis. Intracapsular ankylosis, stiffness of a joint due to the presence of bony or fibrous adhesions between the articular surfaces of the joint. (05 Mar 2000) |
| false Becke line | <microscopy> A second bright line which moves in the direction opposite to the Becke line. It is usually observed with thick particles or when the refractive index difference between particles and mountant is large. It appears as a concentration of reflected light at the high index side of the interface. (05 Aug 1998) |
| false blepharoptosis | A condition resembling an inability to elevate the eyelid, due to blepharophimosis, blepharochalasis, or some other affection. Synonym: false blepharoptosis. Origin: pseudo-+ G. Ptosis, a falling (05 Mar 2000) |