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anorthosite

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noun an·or·tho·site \ə-ˈnȯr-thə-ˌsīt\

Definition of anorthosite

  1. :  a granular plutonic igneous rock composed almost exclusively of a soda-lime feldspar (as labradorite)

anorthositicplay \ə-ˌnȯr-thə-ˈsi-tik\ adjective


Origin of anorthosite

French anorthose, a feldspar, from a- + Greek orthos — more at orth-


First Known Use: 1863


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