orthoclase

 : 
Noun
 : 
or=tho=clase

WORDNET DICTIONARY

Noun orthoclase has 1 sense

CIDE DICTIONARY

orthoclasen. [Ortho- + Gr. to break.].
     Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.  [1913 Webster]

OXFORD DICTIONARY

orthoclase, n. a common alkali feldspar usu. occurring as variously coloured crystals, used in ceramics and glass-making.

Etymology
ORTHO- +Gk klasis breaking

For further exploring for "orthoclase" in Webster Dictionary Online


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