Bible Dictionaries
Aptychus
Webster's Dictionary
(n.) A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula.
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Bibliography Information
Webster, Noah. Entry for 'Aptychus'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/aptychus.html. 1828.