Ordovicianadjective
uk/ˌɔː.dəˈvɪʃ.ən//ˌɔːr.dəˈvɪʃ.ən/specializedfrom or referring to the period of time between about 485 and 445 million years ago, in which there were many different types of animals in the sea, including vertebrates (= animals with back bones), but no life on land:
the Ordovician period
Ordovician fish
Thesaurus: synonyms and related words
Prehistory
- Australopithecus
- broch
- brontosaurus
- carboniferous
- caveman
- mesolithic
- neolithic
- Palaeogene
- palaeolithic
- Paleogene
- prehistory
- primaeval
- primal
- primeval
- primitive
- stegosaurus
- stone-age
- the Anthropocene
- troglodyte
- tyrannosaurus
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the Ordovician
noun [ S ]
the Ordovician period