‖Ap″ty‐chus (�), n. [NL., fr. Gr. ἀ priv. + �, �, fold.] (Zoöl.) A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.