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Pronunciation varies by accent · noun
(zoology) The embryonic shell, or initial chamber, of ammonites and other cephalopods.
Use protoconch when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Protoconch means (zoology) The embryonic shell, or initial chamber, of ammonites and other cephalopods.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use protoconch where its definition matches the intended context.
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