orthoceras

直角石属

词形变化

orthocerata 复数 orthocerata

释义与例句

n.
  1. 1.

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

词源

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

来源：wiktionary