aptychus

CIDE DICTIONARY

aptychus, n. [NL., fr. Gr. 'a priv. + , , fold.].

A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula. [1913 Webster]

For further exploring for "aptychus" in Webster Dictionary Online

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TIP #04: Try using range (OT and NT) to better focus your searches. [ALL]