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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Mammonist :: Mammonist (n.) A mammonite.

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..

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

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

Tetrabranchiata :: Tetrabranchiata (n. pl.) An order of Cephalopoda having four gills. Among living species it includes only the pearly nautilus. Numerous genera and species are found in the fossil state, such as Ammonites, Baculites, Orthoceras, etc..

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

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..

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

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

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

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

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

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

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

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..

Ophiomorphite :: Ophiomorphite (n.) An ammonite.

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..

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

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