Definition of oceanite in English:

oceanite

Pronunciation /ˈəʊʃ(ə)nʌɪt/ /ˈəʊsɪənʌɪt/

noun

Geology
  • Any of various dark-coloured basalts which are very rich in olivine.

Origin

1920s; earliest use found in George Walter Tyrrell (b. 1883). From ocean + -ite, after French océanite, so called because of the abundance of such rocks on ocean islands.