ammonite /ˈamənʌɪt/

a

I. noun

an ammonoid fossil, especially one of a later type found chiefly in the Jurassic and Cretaceous periods, typically with intricately frilled suture lines. Compare with ceratite and goniatite.

●Typified by ammonoids of the order Ammonitida.
– origin mid 18th cent.: from modern Latin ammonites, from medieval Latin cornu Ammonis ‘horn of Ammon’, from the fossil’s resemblance to the ram’s horn associated with Jupiter Ammon (see ammoniacal).

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