anorthosite

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

noun Petrology.

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

QUIZZES

How Hip Is Your Lingo? Take Our Slang Quiz!
If you aren’t already skilled in slang, then this quiz can get you up to speed in no time!
Question 1 of 11
OK Boomer can be perceived as pejorative, but it is mostly considered to be _____

Origin of anorthosite

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

OTHER WORDS FROM anorthosite

an·or·tho·sit·ic [an-aw-thuh-sit-ik] /ænˌɔ θəˈsɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for anorthosite

British Dictionary definitions for anorthosite

anorthosite
/ (ænˈɔːθəˌsaɪt) /

noun

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

Word Origin for anorthosite

C19: from French anorthose (see an-, ortho-) + -ite 1
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

Scientific definitions for anorthosite

anorthosite
[ ăn-ôrthə-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.