SINCE 1828
Ammonoidea
plural noun
Am·mo·noi·dea
| \ ˌaməˈnȯidēə\
Definition of Ammonoidea
: an order of extinct chiefly Mesozoic Tetrabranchia comprising cephalopods having an external chambered shell that is either straight or variously curved or coiled — see ammonite entry 1
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