ORDOVICIAN

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" is a part of...):

Paleozoic; Paleozoic era (from 544 million to about 230 million years ago)

Credits