| 单词 | quaternary |
| 释义 | quaternary adj. & n. --adj 1. having four parts. 2. (Quaternary) Geol. of or relating to the most recent period in the Cenozoic era with evidence of many species of present-day plants and animals (cf. PLEISTOCENE, HOLOCENE). Usage Cf. Appendix II. --n (pl. -ies) 1. a set of four things. 2. (Quaternary) Geol. the Quaternary period or system. Etymology: ME f. L quaternarius f. quaterni distrib. of quattuor four |
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