Anorthosite
Pronunciation : A*nor"tho*site
Part of Speech : n. [F. anorthose triclinic feldspar (fr. Gr. priv. + straight) + -ite.] (Petrol.)
Definition : Defn: A granular igneous rock composed almost exclusively of a soda- lime feldspar, usually labradorite.
Source : Webster's Unabridged Dictionary, 1913