diabase noun.
['dʌɪǝbeɪs] M19.[French, irreg. as if for di- (DI-2) + base, 'rock with two bases'; later perh. assoc. with Greek diabasis transition.]Petrography. Orig. =
DIORITE. Later (in the UK), an altered or (formerly) pre-Tertiary dolerite; (in the US) any dolerite.
■ dia'basic adjective pertaining to or of the nature of diabase
L19. [TahlilGaran] English Dictionary ▲