‖Am‐mon′i‐toid″e‐a (�), n. pl. [NL., fr. Ammonite + -oid.] (Zoöl.) An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.