| Hogben number | Unique personal identifying number constructed by using a sequence of digits for birth date, sex, birthplace, and other identifiers; invented by and named for Lancelot Hogben, British mathematician; Hogben numbers are the basis for identification numbers in many primary care facilities and are used in many record linkage systems. (05 Mar 2000) |
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| Hounsfield number | A normalised value of the calculated X-ray absorption coefficient of a pixel (picture element) in a computed tomogram, expressed in Hounsfield units, where the CT number of air is -1000 and that of water is zero. Synonym: Hounsfield number. (05 Mar 2000) |
| hydrogen number | The quantity of hydrogen that 1 g of fat will absorb; it is a measurement of the amount of unsaturated fatty acids in the fat. See: iodine number. (05 Mar 2000) |
| stoichiometric number | The number associated with a reactant or product participating in a defined chemical reaction; usually an integer. (05 Mar 2000) |
| number | 1. To count; to reckon; to ascertain the units of; to enumerate. "If a man can number the dust of the earth, then shall thy seed also be numbered." (Gen. Xiii. 16) 2. To reckon as one of a collection or multitude. "He was numbered with the transgressors." (Is. Liii. 12) 3. To give or apply a number or numbers to; to assign the place of in a series by order of number; to designate the place of by a number or numeral; as, to number the houses in a street, or the apartments in a building. 4. To amount; to equal in number; to contain; to consist of; as, the army numbers fifty thousand. "Thy tears can not number the dead." (Campbell) Numbering machine, a machine for printing consecutive numbers, as on railway tickets, bank bills, etc. Synonym: To count, enumerate, calculate, tell. Origin: OE. Nombren, noumbren, F. Nombrer, fr. L. Numerare, numeratum. See Number. 1. That which admits of being counted or reckoned; a unit, or an aggregate of units; a numerable aggregate or collection of individuals; an assemblage made up of distinct things expressible by figures. 2. A collection of many individuals; a numerous assemblage; a multitude; many. "Ladies are always of great use to the party they espouse, and never fail to win over numbers." (Addison) 3. A numeral; a word or character denoting a number; as, to put a number on a door. 4. Numerousness; multitude. "Number itself importeth not much in armies where the people are of weak courage." (Bacon) 5. The state or quality of being numerable or countable. "Of whom came nations, tribes, people, and kindreds out of number." (2 Esdras III. 7) 6. Quantity, regarded as made up of an aggregate of separate things. 7. That which is regulated by count; poetic measure, as divisions of time or number of syllables; hence, poetry, verse; chiefly used in the plural. "I lisped in numbers, for the numbers came." (Pope) 8. The distinction of objects, as one, or more than one (in some languages, as one, or two, or more than two), expressed (usually) by a difference in the form of a word; thus, the singular number and the plural number are the names of the forms of a word indicating the objects denoted or referred to by the word as one, or as more than one. 9. <mathematics> The measure of the relation between quantities or things of the same kind; that abstract species of quantity which is capable of being expressed by figures; numerical value. Abstract number, Abundant number, Cardinal number, etc. See Abstract, Abundant, etc. In numbers, in numbered parts; as, a book published in numbers. Origin: OE. Nombre, F. Nombre, L. Numerus; akin to Gr. That which is dealt out, fr. To deal out, distribute. See Numb, Nomad, and cf. Numerate, Numero, Numerous. Source: Websters Dictionary (01 Mar 1998) |
| dibucaine number | A test for differentiation of one of several forms of atypical pseudocholinesterases that are unable to inactivate succinylcholine at normal rates; based upon percent inhibition of the enzymes by dibucaine, normal enzyme has a DN of 75 and above, heterozygous atypical enzyme has a DN of 40-70, and homozygous atypical enzyme has a DN of less than 20. See: fluoride number. (05 Mar 2000) |
| dominance threshold number | The number at which 50 percent of the total dominance measure for a given stratum is represented by one or more plant species when ranked in descending order of abundance (i.e., from most to least abundant), when this number is immediately exceeded, the dominant species for the stratum are realised. (09 Oct 1997) |
| iodine number | An indication of the quantity of unsaturated fatty acids present in a fat; it represents the number of grams of iodine absorbed by each 100 g of fat. See: hydrogen number. Synonym: iodine value. (05 Mar 2000) |
| oxidation number | The number of electrons necessary to restore an atom in a combined state to its elemental form. (09 Oct 1997) |
| thiocyanogen number | The number of grams of thiocyanogen taken up by 100 g of fat; analogous to the iodine number, except that thiocyanogen will not add to all the double bonds in polyunsaturated fatty acids as will iodine. Synonym: thiocyanogen value. (05 Mar 2000) |
| electronic number | <chemistry> The number of electrons in the outermost orbit (valence shell) of an element. (05 Mar 2000) |
| transport number | The fraction of the total current carried through a solution by a particular type of ion present in that solution. (05 Mar 2000) |
| turnover number | <biochemistry, pharmacology> Equivalent to Vmax, being the number of substrate molecules converted to product by one molecule of enzyme in unit time, when the substrate is saturating. (18 Nov 1997) |
| Kestenbaum's number | The difference between the two pupil diameters when each eye is measured in bright light with the other eye tightly covered; an indicator of the relative afferent pupillary defect in patients with two normally innervated irises. (05 Mar 2000) |
| Knoop hardness number | A number obtained by dividing the load in kg applied to a pyramid-shaped diamond of specific size divided by the projected area of the impression: KHN = L/A, where A= the projected area of the impression in mm2 and L= the load in kg; used for measurements of hardness of any materials, especially very hard and brittle substances such as tooth dentin and enamel. (05 Mar 2000) |