'Sanidine' definitions:

Definition of 'Sanidine'

From: GCIDE

Sanidine \San"i*dine\, n. [Gr. ?. ?, a board. So called in allusion to the tabular crystals.] (Min.) A variety of orthoclase feldspar common in certain eruptive rocks, as trachyte; -- called also glassy feldspar. [1913 Webster]