- any extinct marine cephalopod mollusc of the order Ammonoidea, which were common in Mesozoic times and generally had a coiled partitioned shell. Their closest modern relative is the pearly nautilus
- the shell of any of these animals, commonly occurring as a fossil
WordReference Random House Unabridged Dictionary of American English © 2018
- the coiled, chambered fossil shell of an ammonoid.
- Medieval Latin (cornū) Ammōn(is) (literally, horn of Ammon) + -ītes -ite1; fossil so called from its resemblance to the horn of Jupiter Ammon
- Neo-Latin Ammonites
am•mo•nite2 (am′ə nīt′),USA pronunciation n.
- a nitrogenous mixture consisting chiefly of dried animal fats, usually obtained from livestock carcasses, and used as a fertilizer.
- ammo(nium) + nit(rat)e 1600–10
Am•mon•ite (am′ə nīt′),USA pronunciation n.
- Ancient Historyan inhabitant of Ammon.
- Ancient Historyof or pertaining to the Ammonites.
- Ammon + -ite1 1605–15