Ordovician

名词 ordovician:

1. from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
   同义词：Ordovician period

Or.do.vi.cian

adj.（形容词）
Of, relating to, or designating the geologic time, system of rocks, and sedimentary deposits of the second period of the Paleozoic Era, characterized by the appearance of primitive fishes.See table at geologic time
奥陶纪（系）的：属于、有关或指奥陶纪（系）的，奥陶纪（系）是指古生代第二纪的一段地质时间、岩石系统及沉积物，该纪以早期鱼的出现为特征参见 geologic time
n.（名词）
The Ordovician Period.
奥陶纪

来源：
From Latin Ordovicôs [an ancient Celtic tribe of Wales]
源自 拉丁语 Ordovicôs [古代威尔士的凯尔特部落]
from Celtic Ordovices * see weik- 3
源自 凯尔特语 Ordovices *参见 weik- 3