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anorthosite Definition

an·or·tho·site (an ôr′t̸hō sīt′; -t̸hə-)

noun

a type of gabbro, usually light-colored, made up almost entirely of plagioclase feldspars, esp. labradorite

Etymology: < Fr anorthose < Gr an-, not + orthos (see anorthite) + -ite