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2 definitions found
 for cornu Ammonis
From The Collaborative International Dictionary of English v.0.48 :

  Cornu Ammonis \Cor"nu Am*mo"nis\ ([a^]m*m[=o]"n[i^]s); pl.
     Cornua Ammonis. [L., horn of Ammon. See Ammonite.]
     (Paleon.)
     A fossil shell, curved like a ram's horn; an obsolete name
     for an ammonite.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Ammonite \Am"mon*ite\, n. [L. cornu Ammonis born of Ammon; L.
     Ammon, Gr. ? an appellation of Jupiter, as represented with
     the horns of a ram. It was originally the name of an.
     Egyptian god, Amun.] (Paleon.)
     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.
     [1913 Webster]

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