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Pronunciation varies by accent · noun
(paleontology) Any of numerous species of fossil brachiopods of the genera †Spirifer and †Delthyris and allied genera in order †Spiriferida, in which the long calcareous supports of the arms form a large spiral, or helix, on each side..
Use spirifer when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Spirifer means (paleontology) Any of numerous species of fossil brachiopods of the genera †Spirifer and †Delthyris and allied genera in order †Spiriferida, in which the long calcareous supports of the arms form a large spiral, or helix, on each side..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use spirifer where its definition matches the intended context.
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