| / English Dictionary |
ORDOVICIAN PERIOD
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
Synonyms:
Ordovician; Ordovician period
Classified under:
Nouns denoting time and temporal relations
Instance hypernyms:
geological period; period (a unit of geological time during which a system of rocks formed)
Holonyms ("Ordovician period" is a part of...):
Paleozoic; Paleozoic era (from 544 million to about 230 million years ago)
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