Lexic.us

Definition of Aptychus

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

Definition of Aptychus

1. Noun. A marine fossil consisting of a hard anatomical structure like a curved shelly plate, once part of the body of an ammonite. ¹

¹ Source: wiktionary.com

Medical Definition of Aptychus

1. A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula. Origin: NL, fr. Gr. Priv. +, fold. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Aptychus

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