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| | | | | | quaternary | (n) last 2 million years, Syn. Quaternary period, Age of Man | | quaternary ammonium compound | (n) a compound derived from ammonium with hydrogen atoms replaced by organic groups; used as surface-active agents, disinfectants, and in drugs | | four | (n) the cardinal number that is the sum of three and one, Syn. tetrad, quatern, Little Joe, 4, IV, quartet, quaternary, quaternity, quaternion, foursome, quadruplet | | fourth | (adj) coming next after the third and just before the fifth in position or time or degree or magnitude, Syn. 4th, quaternary | | quaternate | (adj) consisting of or especially arranged in sets of four, Syn. quaternary |
| | Quaternary | a. [ L. quaternarius consisting of four each, containing four, fr. quaterni four each, fr. quattuor four: cf. F. quaternaire. See Four. ] [ 1913 Webster ] 1. Consisting of four; by fours, or in sets of four. [ 1913 Webster ] 2. (Geol.) Later than, or subsequent to, the Tertiary; Post-tertiary; as, the Quaternary age, or Age of man. [ 1913 Webster ] | | Quaternary | n. [ L. numerus quaternarius: cf. F. quaternaire. ] 1. The number four. Boyle. [ 1913 Webster ] 2. (Geol.) The Quaternary age, era, or formation. See the Chart of Geology. [ 1913 Webster ] |
| | 第四纪 | [dì sì jì, ㄉㄧˋ ㄙˋ ㄐㄧˋ, 第 四 纪 / 第 四 紀] fourth period; quaternary (geological period covering the recent ice ages over the last 180, 000 years) #57,640 [Add to Longdo] |
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