noun Petrology.
a granular plutonic rock composed largely of labradorite or a more calcic feldspar.

1860–65; < French anorthose anorthoclase (an- an-1 + Greek orthós straight) + -ite1

anorthositic [an-aw-thuh-sit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anorthosite (ænˈɔːθəˌsaɪt)
a coarse-grained plutonic igneous rock consisting almost entirely of plagioclase feldspar
[C19: from French anorthose (see an-, ortho-) + -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
anorthosite   (ān-ôr'thə-sīt')  Pronunciation Key 
An igneous rock consisting almost entirely of plagioclase feldspar, especially the labradorite variety. Anorthosites have been identified among rock samples collected from the Moon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Unit also includes small intrusive complexes of anorthosite, gabbroic anorthosite, and anorthositic gabbro.
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