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plural ammonites
(paleontology) Any of an extinct group of cephalopods of the subclass Ammonoidea; a fossil shell of such an animal. quotations
Ammonites floated through the world's shallow oceans for more than three hundred million years, and their fossilized shells turn up all around the world.
2014, Elizabeth Kolbert, The Sixth Extinction: An Unnatural History, Picador, page 83
uncountable
An explosive prepared from a mixture of TNT and ammonium nitrate; a form of amatol, popular in Eastern Europe and China. examples