clase

-clase

a combining form used in the formation of compound words that denote minerals with a particular cleavage, as specified by the initial element: oligoclase; plagioclase.

Origin:
< French < Greek klásis; see -clasis

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-clase
 
n combining form
(in mineralogy) indicating a particular type of cleavage: plagioclase
 
[via French from Greek klasis a breaking, from klan to break]

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