Definition of ammonite in English:

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ammonite

Pronunciation: /ˈamənʌɪt/

noun

Image of ammonite
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.
Example sentences
  • Argonauta shares other characteristics with some Jurassic and Cretaceous ammonites, namely multicuspid rachidial tooth on the radula.
  • The fossil content consists of ammonites, belemnites, brachiopods, echinoderms, bivalves, crinoids, gastropods, ostracodes and benthic foraminifers.
  • A feature of especial interest is that, while the youngest Triassic ammonites are quite rare, the oldest Jurassic ammonites are extremely abundant, entering the succession in a veritable flood.

Origin

Mid 18th century: 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).

For editors and proofreaders

Line breaks: am¦mon|ite

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