| 单词 | Ordovician |
| 释义 | Ordovician /awr'deuh vish"euhn/, Geol. adj. 1. noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish. See table at GEOLOGIC TIME. n. 2. the Ordovician Period or System. [1879; after the Ordovices (pl.) ( < L) an ancient British tribe in N Wales, where rocks characterizing the period were found; see -IAN] |
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