Lexic.us

Definition of Ammonitoidea

1. n. pl. An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite.

Medical Definition of Ammonitoidea

1. An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite. Origin: NL, fr. Ammonite. Source: Websters Dictionary (01 Mar 1998)

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