| Reynold's number | <physiology> A constant without dimensions that relates the inertial and viscous drag acting to hinder a body moving through fluid medium. For cells the Reynold's number is very small, viscous drag is dominant and inertial resistance can be neglected. (18 Nov 1997) |
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| MIM number | The catalog assignment for a mendelian trait in the MIM system. If the initial digit is 1, the trait is deemed autosomal dominant; if 2, autosomal recessive; if 3, then X-linked. Wherever a trait defined in this dictionary has a MIM number the number from the tenth edition of MIM is given in square brackets with or without an asterisk as appropriate e.g., Pelizaeus-Merzbacher disease is a well-established, autosomal, dominant, mendelian disorder. (05 Mar 2000) |
| wave number | <microscopy> The number of waves or cycles of light flux or radiant energy, measured through a distance of 1 cm. (05 Aug 1998) |
| writhing number | <molecular biology> The number of times the axis of a DNA helix crosses itself while the molecule is in the process of supercoiling. (09 Oct 1997) |
| copy number | The number of molecules of a particular type on or in a cell or part of a cell. Usually applied to specific genes or to plasmids within a bacterium. (18 Nov 1997) |
| Polenske number | The number of milliliters of 0.1 n KOH required to neutralise the nonvolatile fatty acids obtained from 5 g of a saponified fat or oil. (05 Mar 2000) |
| CT 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) |
| haploid number | <cell biology, genetics> The haploid number is the total number of chromosomes in a single set, such as would be found in a gamete or a haploid somatic cell (such as in fungus or gametophyte plants). In humans, the haploid number would be 23. (09 Oct 1997) |
| Hehner number | The weight or percentage of the nonvolatile fatty acids yielded by 5 g of a saponified fat or oil. Synonym: Hehner value. (05 Mar 2000) |
| saponification number | The number of milligrams of KOH required to saponify 1 g of fat; an approximate measure of the average molecular weight of a fat, with which it varies inversely. Synonym: Koettstorfer number. (05 Mar 2000) |
| 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) |
| 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) |