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Or·do·vi·cian AHD[ôr'də-vĭshʹən] D.J.[ˌɔːdəˈvɪʃən]K.K.[ˌɔrdəˈvɪʃən]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
- From Latin Ordovicēs [an ancient Celtic tribe of Wales] 源自 拉丁语 Ordovicēs [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
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