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anorthosite

American  
[an-awr-thuh-sahyt] / ænˈɔr θəˌsaɪt /

noun

Petrology.

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

anorthosite British  
/ ænˈɔːθəˌsaɪt /

noun

  1. a coarse-grained plutonic igneous rock consisting almost entirely of plagioclase feldspar

"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
anorthosite Scientific  
/ ăn-ôr′thə-sīt′ /

  1. An igneous rock consisting almost entirely of plagioclase feldspar, especially the labradorite variety. Anorthosites have been identified among rock samples collected from the Moon.

Other Word Forms

  • anorthositic adjective

Etymology

Origin of anorthosite

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.