Hypertext Webster Gateway: "anorthite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Anorthite \A*nor"thite\, n. [Gr. 'an priv. + ? straight (? sc. ?
right angle); not in a right angle.]
A mineral of the feldspar family, commonly occurring in small
glassy crystals, also a constituent of some igneous rocks. It
is a lime feldspar. See {Feldspar}.
From WordNet (r) 1.7 (wn)
anorthite
n : rare plagioclastic feldspar occurring in many igneous rocks
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