Orthoclase definitions

ôr'thə-klās', -klāz'
A white to yellowish red monoclinic mineral of the potassium feldspar group that forms from medium- to low-temperature magmas.
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A monoclinic feldspar, KAlSi3O8, that is dimorphic with microcline; potassium aluminum silicate.
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A white to yellowish red monoclinic mineral of the potassium feldspar group that forms from medium- to low-temperature magmas. Chemical formula: KAlSi3O8.
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(mineralogy) Potassium aluminum silicate, KAlSi3O8, a common feldspar of igneous, plutonic, and metamorphic rocks. Orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in the ceramic and glass industries and as a decorative gravel.
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Origin of orthoclase

Greek ortho- ortho- Greek klasis a breaking (from klān to break)