Definition of aptychus
English to English noun - A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula.
source: Webster 1913
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aptychus, aphthous, apothesis, apotheose, apotheosis, apotheosize, apodous, aptotic, apotheosise, aphides, apothecary's, apoptosis, apothecary, affettuoso, abydos, abatis, abatic, apodes, abattis, abietic
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