a granular igneous rock consisting essentially of plagioclase feldspar and hornblende.

1820–30; < French < Greek dior(ízein) to distinguish (see di-3, horizon) + French -ite -ite1

dioritic [dahy-uh-rit-ik] , adjective
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World English Dictionary
diorite (ˈdaɪəˌraɪt)
a dark coarse-grained igneous plutonic rock consisting of plagioclase feldspar and ferromagnesian minerals such as hornblende
[C19: from French, from Greek diorizein to distinguish (from dia- apart + horizein to define) + -ite1]

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American Heritage
Science Dictionary
diorite   (dī'ə-rīt')  Pronunciation Key 
A gray, coarse-grained plutonic rock. Diorite consists mainly of sodium-rich plagioclase and one or more mafic minerals such as biotite, hornblende, or pyroxene. It is the coarse-grained equivalent of andesite.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Hornblende gabbro locally intrudes and is mapped with the diorite.
Diorite exposed here is a dark-colored, fine- to medium-grained hornblende diorite.
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