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

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

Pentaptych :: Pentaptych (n.) A picture, or combination of pictures, consisting of a centerpiece and double folding doors or wings, as for an altarpiece..

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