orthoclase Meaning, Definition & Usage

  1. noun a white or colored monoclinic feldspar

WordNet

Or"tho*clase noun
Etymology
Ortho- + Gr. to break.
Definitions
  1. (Min.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.

Webster 1913