Ammonitoidea

Ammonitoidea

Am*mon`i*toid"e*a\, n. pl. [NL., fr. Ammonite + -oid.] (Zo["o]l.) An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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