from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The coiled, flat, chambered fossil shell of an extinct cephalopod mollusk that was abundant in the Cretaceous Period.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An explosive prepared from ammonium nitrate; amatol
- n. Any of an extinct group of cephalopods of the subfamily Ammonoidea; a fossil shell of such an animal
from the GNU version of the Collaborative International Dictionary of English
- n. A fossil cephalopod shell related to the nautilus. There are many genera and species, and all are extinct, the typical forms having existed only in the Mesozoic age, when they were exceedingly numerous. They differ from the nautili in having the margins of the septa very much lobed or plaited, and the siphuncle dorsal. Also called serpent stone, snake stone, and cornu Ammonis.
from The Century Dictionary and Cyclopedia
- n. One of the fossil shells of an extensive genus (Ammonites) of extinct cephalopodous mollusks (cuttle-fishes), of the family Ammonitidæ, coiled in a plane spiral, and chambered within like the shell of the existing nautilus, to which the ammonites were allied.
- n. A name applied to certain explosive materials, patented by Favier, containing ammonium nitrate with other substances, chiefly nitro- or dinitro-naphthalene.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. one of the coiled chambered fossil shells of extinct mollusks
New Latin Ammōnītēs, from Latin (cornū) Ammōnis, (horn) of Amen, ammonite, genitive of Ammōn, Amen, from Greek.(American Heritage® Dictionary of the English Language, Fourth Edition)
French ammonite, from Latin ammonis (cornua) "(horns of) Ammon". (Wiktionary)