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anorthosite

[an-awr-thuh-sahyt] /ænˈɔr θəˌsaɪt/
noun, Petrology
1.
a granular plutonic rock composed largely of labradorite or a more calcic feldspar.
Origin
1860-1865
1860-65; < French anorthose anorthoclase (an- an-1 + Greek orthós straight) + -ite1
Related forms
anorthositic
[an-aw-thuh-sit-ik] /ænˌɔ θəˈsɪt ɪk/ (Show IPA),
adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for anorthositic

anorthosite

/ænˈɔːθəˌsaɪt/
noun
1.
a coarse-grained plutonic igneous rock consisting almost entirely of plagioclase feldspar
Word Origin
C19: from French anorthose (see an-, ortho-) + -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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anorthositic in Science
anorthosite
  (ān-ôr'thə-sīt')   
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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