diorite

noun
di·o·rite | \ˈdī-ə-ˌrīt \

Definition of diorite 

: a granular crystalline igneous rock commonly of acid plagioclase and hornblende, pyroxene, or biotite

Other Words from diorite

dioritic \ˌdī-ə-ˈri-tik \ adjective

First Known Use of diorite

1826, in the meaning defined above

History and Etymology for diorite

French, irregular from Greek diorizein to distinguish, from dia- + horizein to define — more at horizon

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The first known use of diorite was in 1826

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