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Pronunciation varies by accent · noun
Any of a group of basal or primitive Late Paleozoic synapsid amniotes, part of a polyphyletic grade, formerly regarded as order Pelycosauria..
Use pelycosaur when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Pelycosaur means Any of a group of basal or primitive Late Paleozoic synapsid amniotes, part of a polyphyletic grade, formerly regarded as order Pelycosauria..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use pelycosaur where its definition matches the intended context.
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