Anorthosite Definition

ăn-ôrthə-sīt
noun
An igneous rock consisting almost entirely of plagioclase feldspar, especially the labradorite variety.
American Heritage
A type of gabbro, usually light-colored, made up almost entirely of plagioclase feldspars, esp. labradorite.
Webster's New World

(geology) A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar.

Wiktionary

Other Word Forms of Anorthosite

Noun

Singular:
anorthosite
Plural:
anorthosites

Origin of Anorthosite

  • French anorthose a kind of feldspar (Greek an- not a–1) (Greek orthos straight) –ite

    From American Heritage Dictionary of the English Language, 5th Edition

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