English definition of Ammonite

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Definition of ammonite

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Ammonite (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..

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Scaphite :: Scaphite (n.) Any fossil cephalopod shell of the genus Scaphites, belonging to the Ammonite family and having a chambered boat-shaped shell. Scaphites are found in the Cretaceous formation..

Ammonitoidea :: Ammonitoidea (n. pl.) An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite.

Ophiomorphite :: Ophiomorphite (n.) An ammonite.

Turrilite :: Turrilite (n.) Any fossil ammonite of the genus Turrilites. The shell forms an open spiral with the later whorls separate.

Lituite :: Lituite (n.) Any species of ammonites of the genus Lituites. They are found in the Cretaceous formation.

Hamite :: Hamite (n.) A fossil cephalopod of the genus Hamites, related to the ammonites, but having the last whorl bent into a hooklike form..

Mammonist :: Mammonist (n.) A mammonite.

Protoconch :: Protoconch (n.) The embryonic shell, or first chamber, of ammonites and other cephalopods..

Ammonite :: Ammonite (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..

Baculite :: Baculite (n.) A cephalopod of the extinct genus Baculites, found fossil in the Cretaceous rocks. It is like an uncoiled ammonite..

Goniatite :: Goniatite (n.) One of an extinct genus of fossil cephalopods, allied to the Ammonites. The earliest forms are found in the Devonian formation, the latest, in the Triassic..

Moloch :: Moloch (n.) The fire god of the Ammonites in Canaan, to whom human sacrifices were offered; Molech. Also applied figuratively..

Molech :: Molech (n.) The fire god of the Ammonites, to whom human sacrifices were offered; Moloch..

Anaptychus :: Anaptychus (n.) One of a pair of shelly plates found in some cephalopods, as the ammonites..

Prosiphon :: Prosiphon (n.) A minute tube found in the protoconch of ammonites, and not connected with the true siphon..

Mammonite :: Mammonite (n.) One devoted to the acquisition of wealth or the service of Mammon.

Cornu Ammonis :: Cornu Ammonis () A fossil shell, curved like a ram's horn; an obsolete name for an ammonite..

Snakestone :: Snakestone (n.) An ammonite; -- so called from its form, which resembles that of a coiled snake..

Aptychus :: Aptychus (n.) A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula..

Ammonitiferous :: Ammonitiferous (a.) Containing fossil ammonites.