WordReference Random House Unabridged Dictionary of American English © 2018
am•mo•nite1  (amə nīt′),USA pronunciation n. 
  1. the coiled, chambered fossil shell of an ammonoid.
am•mo•nit•ic  (am′ə nitik),USA pronunciation adj.  am•mon•i•toid  (ə moni toid′),USA pronunciation adj. 
  • 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
  • 1700–10;

am•mo•nite2  (amə nīt′),USA pronunciation n. 
  1. 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  (amə nīt′),USA pronunciation n. 
  1. Ancient Historyan inhabitant of Ammon.

adj. 
  1. Ancient Historyof or pertaining to the Ammonites.
Ammon•it′ish, adj. 
  • Ammon + -ite1 1605–15


Collins Concise English Dictionary © HarperCollins Publishers::

ammonite /ˈæməˌnaɪt/ n
  1. 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
  2. the shell of any of these animals, commonly occurring as a fossil
Etymology: 18th Century: from New Latin Ammōnītēs, from Medieval Latin cornū Ammōnis, literally: horn of Ammon



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