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ammoniteMain Entry: am·mo·nite Pronunciation: \ˈa-mə-ˌnīt\ Function: noun Etymology: New Latin ammonites, from Latin cornu Ammonis, literally, horn of Ammon Date: 1758 : any of a subclass (Ammonoidea) of extinct cephalopods especially abundant in the Mesozoic age that had flat spiral shells with the interior divided by septa into chambers — am·mo·nit·ic \ˌa-mə-ˈni-tik\ adjective
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