n.
Pronunciation: ' pl ā -j( ē -) ə - ˌ kl ā s, ' pla-, - ˌ kl ā z
Function: noun
Etymology: Greek plagios oblique + klasis breaking, from klan to break ― more at CLAST
Date: circa 1868
: a triclinic feldspar especially : one having calcium or sodium in its composition