orthoclase

noun

or·​tho·​clase ˈȯr-thə-ˌklās How to pronounce orthoclase (audio)
-ˌklāz
: a monoclinic mineral of the feldspar group consisting of a silicate of potassium and aluminum

Word History

Etymology

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

First Known Use

1849, in the meaning defined above

Time Traveler
The first known use of orthoclase was in 1849

Dictionary Entries Near orthoclase

Cite this Entry

“Orthoclase.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/orthoclase. Accessed 5 Dec. 2022.

Kids Definition

orthoclase

noun

or·​tho·​clase ˈȯr-thə-ˌklās How to pronounce orthoclase (audio)
-ˌklāz
: a mineral consisting especially of potassium feldspar

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