noun Petrography.

a schistose metamorphic rock resulting from the alteration of augite to hornblende in a gabbro or dolerite.

Origin of epidiorite

First recorded in 1885–90; epi- + diorite
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for epidiorite

Historical Examples of epidiorite