Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

orthoclase

play
noun or·tho·clase \ˈȯr-thə-ˌklās, -ˌklāz\

Definition of orthoclase

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



Origin of orthoclase

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


First Known Use: 1849


Learn More about orthoclase


Seen and Heard

What made you want to look up orthoclase? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to expose to danger or risk

Get Word of the Day daily email!