pair

pair
Two objects considered together because of similarity, for a common purpose, or because of some attracting force between them.
- base p. (b.p.) the complex of two heterocyclic nucleic acid bases, one a pyrimidine and the other a purine, brought about by hydrogen bonding between the purine and the pyrimidine; base pairing is the essential element in the structure of DNA proposed by J. Watson and F. Crick in 1953; usually guanine is paired with cytosine (G C), and adenine with thymine (A T) or uracil (A U). SYN: nucleoside p., nucleotide p..
- buffer p. an acid and its conjugate base (anion).
- chromosome p. two chromosomes of the full diploid karyotype that are similar in form and function but that usually differ in content, one normally being inherited from each parent and one being transmitted to each progeny; in the heteromorphic sex (in humans, the male), one p., the sex chromosomes, differ markedly in appearance, content, and function.
- conjugate acid-base p. in prototonic solvents ( e.g., H2O, NH3, acetic acid), two molecular species differing only in the presence or absence of a hydrogen ion ( e.g., carbonic acid /bicarbonate ion or ammonium ion/ammonia); the basis of buffer action.
- line pairs a unit of resolution of radiographic screens and films or photographic films; greatest number of line pairs per cm that can be resolved.
- nucleoside p., nucleotide p. SYN: base p..
- p. production creation of a positron and electron, each of mass 0.511 MeV, when an incident photon of energy greater than 1.02 MeV is absorbed by matter; occurs in high-energy radiotherapy.

* * *

(pār) 1. a combination of two related, similar, or identical entities or objects. 2. in cardiology, two successive premature beats, particularly two ventricular premature complexes. Called also couplet.

Medical dictionary. 2011.

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Synonyms:
(of the same kind or suited to each other), , / , , , / , / ,


Look at other dictionaries:

  • pair — pair …   Dictionnaire des rimes

  • pair — pair, aire (pêr, pê r ) adj. 1°   Égal, semblable, pareil ; ne se dit plus, en ce sens, que dans la locution : sans pair. •   Elles [deux chèvres] avaient la gloire De compter dans leur race, à ce que dit l histoire, L une certaine chèvre au… …   Dictionnaire de la Langue Française d'Émile Littré

  • Pair — (p[^a]r), n. [F. paire, LL. paria, L. paria, pl. of par pair, fr. par, adj., equal. Cf. {Apparel}, {Par} equality, {Peer} an equal.] [1913 Webster] 1. A number of things resembling one another, or belonging together; a set; as, a pair or flight… …   The Collaborative International Dictionary of English

  • pair — 1. Used as a collective noun, pair is treated as a plural when it denotes two separate items and as a singular when it denotes a unit: so a pair of gloves, scissors, scales, shoes, trousers, etc. are singular whereas a pair of bachelors, dogs,… …   Modern English usage

  • pair — [per] n. pl. pairs or pair [ME paire < OFr < L paria, neut. pl. of par, equal: see PAR1] 1. two similar or corresponding things joined, associated, or used together [a pair of gloves] 2. a single thing made up of two corresponding parts… …   English World dictionary

  • pair — [peə ǁ per] verb [transitive] 1. COMMERCE if two companies, people, or things are paired, they are put into groups of two because they are connected in some way or will work together: • When the new products were paired, encouraging customer… …   Financial and business terms

  • pair up — ˌpair ˈup [intransitive/transitive] [present tense I/you/we/they pair up he/she/it pairs up present participle pairing up past tense …   Useful english dictionary

  • pair — PAIR, pairi, s.m. Titlu purtat de marii vasali ai regelui în Franţa şi în Anglia în evul mediu. ♦ Membru (pe viaţă) al uneia dintre cele două camere legislative din Franţa între 1815 şi 1848. ♦ Titlu de nobleţe în Marea Britanie, care conferă… …   Dicționar Român

  • Pair — Pair, v. i. [imp. & p. p. {Paired}; p. pr. & vb. n. {Pairing}.] 1. To be joined in pairs; to couple; to mate, as for breeding. [1913 Webster] 2. To suit; to fit, as a counterpart. [1913 Webster] My heart was made to fit and pair with thine. Rowe …   The Collaborative International Dictionary of English

  • pair — 〈[pɛ:r] Adj.; Roulett; bei Zahlen〉 gerade; Ggs impair [frz.] * * * pair [pɛ:ɐ̯ ] <Adj.> [frz. pair < afrz. per < lat. par, ↑ Paar]: (von den Zahlen beim Roulette) gerade. * * * pair   [pɛː …   Universal-Lexikon

  • Pair — 〈[ pɛ:r] m. 6; im alten Frankreich〉 Angehöriger des politisch bevorzugten Hochadels [frz. <lat. paria „Gleiches“] * * * pair [pɛ:ɐ̯ ] <Adj.> [frz. pair < afrz. per < lat. par, ↑ Paar]: (von den Zahlen beim Roulette) gerade. * * *… …   Universal-Lexikon

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