Metadiorite

A metamorphically-altered diorite. i. A contraction of metamorphic diorite that was proposed for certain metamorphic rocks that resemble diorite, but which may have been the result of the metamorphism of sedimentary rocks (pseudodiorite). Compare with: metadiabase Ref: Fay ii. Metamorphosed gabbro, diabase, or diorite. Ref: AGI