Orthoceras

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Any nautiloid cephalopod mollusc of the genus Orthoceras, known only as fossils

Etymology

From ortho- + Ancient Greek κέρας (kéras, “a horn”).

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.