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Pronunciation varies by accent · noun
(paleontology) A hard calcareous plate forming part of the body of an ammonite..
It wasn't until the 1970s that paleontologists had amassed enough evidence to be certain that aptychi were modified lower jaws.
Use aptychus when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Aptychus means (paleontology) A hard calcareous plate forming part of the body of an ammonite..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
It wasn't until the 1970s that paleontologists had amassed enough evidence to be certain that aptychi were modified lower jaws.
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