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anorthositeOne entry found. Main Entry: an·or·tho·site Pronunciation: \ə-ˈnȯr-thə-ˌsīt\ Function: noun Etymology: French anorthose, a feldspar, from a- + Greek orthos — more at orth- Date: 1863 : 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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