First Known Use: 1863
Dictionary
anorthosite
noun an·or·tho·site \ə-ˈnȯr-thə-ˌsīt\
Definition of ANORTHOSITE
: a granular plutonic igneous rock composed almost exclusively of a soda-lime feldspar (as labradorite)
— an·or·tho·si·tic \ə-ˌnȯr-thə-ˈsi-tik\ adjective
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Origin of ANORTHOSITE
French anorthose, a feldspar, from a- + Greek orthos — more at orth-
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