cornu ammonis

noun

A fossil shell, curved like a ram's horn; an ammonite.

OriginLatin cornū Ammōnis →
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Meanings

nouncornu ammonis (plural cornua ammonis)

plural cornua ammonis · alternative cornu Ammonis

  1. obsoletebiologyA fossil shell, curved like a ram's horn; an ammonite.
  2. obsoleteanatomyThe hippocampus of the brain.

Origin

  1. Latincornū Ammōnis“Ammon's horn”
  2. Englishcornu ammonis

From Latin cornū Ammōnis (“Ammon's horn”). See ammonite.

More words from Latin

Full word history & related roots →
Cite this entry
APA

cornu ammonis. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/cornu%20ammonis

MLA

“cornu ammonis.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/cornu%20ammonis. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “cornu ammonis,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/cornu%20ammonis.

Source: cornu ammonis on Wiktionary, CC BY-SA 4.0.