Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of aptychus is as below...

Aptychus :: Aptychus (n.) A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula..

Anaptychus :: Anaptychus (n.) One of a pair of shelly plates found in some cephalopods, as the ammonites..

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