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Pronunciation varies by accent · noun
(paleontology) Any of many box-, tube- or ring-shaped marine heterodont bivalves from the Jurassic and Cretaceous periods..
In its shallow waters, now-extinct clams known as rudists formed extensive beds.
Use rudist when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Rudist means (paleontology) Any of many box-, tube- or ring-shaped marine heterodont bivalves from the Jurassic and Cretaceous periods..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
In its shallow waters, now-extinct clams known as rudists formed extensive beds.
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