orthoclase

noun
or·​tho·​clase | \ ˈȯr-thə-ˌklās How to pronounce orthoclase (audio) , -ˌklāz \

Definition of orthoclase

: a monoclinic mineral of the feldspar group consisting of a silicate of potassium and aluminum

First Known Use of orthoclase

1849, in the meaning defined above

History and Etymology for orthoclase

German Orthoklas, from orth- + Greek klasis breaking, from klan to break — more at clast

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The first known use of orthoclase was in 1849

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Cite this Entry

“Orthoclase.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/orthoclase. Accessed 24 Jun. 2021.

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More from Merriam-Webster on orthoclase

Britannica.com: Encyclopedia article about orthoclase

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