quaternary

名词 quaternary:

1. last 2 million years
   同义词：Quaternary period, Age of Man
2. the cardinal number that is the sum of three and one
   同义词：four, 4, IV, tetrad, quatern, quaternion, quaternity, quartet, quadruplet, foursome, Little Joe

形容词 quaternary:

1. consisting of or especially arranged in sets of four
   同义词：quaternate
2. coming next after the third and just before the fifth in position or time or degree or magnitude
   同义词：fourth, 4th

qua.ter.nar.y

adj.（形容词）
Consisting of four; in fours.
由四部分组成的；四个一组的
Quaternary Geology Of, belonging to, or designating the geologic time, system of rocks, and sedimentary deposits of the second period of the Cenozoic Era, from the end of the Tertiary Period through the present, characterized by the appearance and development of human beings and including the Pleistocene Epoch and the Holocene Epoch.See table at geologic time
Quaternary 【地质学】 第四纪的：地质时期的，属于或标志地质时期的，岩石系统，新生代第二纪的沉积层，从第三纪末至今，其特征为：人类的出现和发展，并包括更新世和始新世参见 geologic time
Chemistry Relating to an atom bonded to four carbon atoms:
【化学】 四元的：与四个碳原子相连的原子有关的：
例句：
a quarternary nitrogen atom.
和四个碳原子相连的氮原子

n.（名词）
【复数】 qua.ter.nar.ies
The number four.
数字四
The member of a group that is fourth in order.
在等级上位于第四的一组成员
Quaternary Geology The second period of the Cenozoic Era and its system of deposits.
Quaternary 【地质学】 第四纪：新生代第二纪及沉积系

来源：
Latin quatern3rius
拉丁语 quatern3rius
from quaterno [by fours]
源自 quaterno [分为四份]
from quater [four times] * see k wetwer-
源自 quater [四倍] *参见 k wetwer-