Definition of macrochoanite in US English:

macrochoanite

noun

historical
  • A fossil nautiloid of the former group Macrochoanites (of unspecified rank, more or less equivalent to the modern family Bactritidae), characterized by relatively long septal necks.

Origin

Late 19th century. From scientific Latin Macrochoanites from macro- + ancient Greek χοάνη funnel + scientific Latin -ites: compare choanite.

Pronunciation

macrochoanite

/ˌmakrəʊˈkəʊənʌɪt/