Webster's English Dictionary

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microcline

mi.cro.cline \'mi--kro--.kli-n\ n [G mikroklin, fr. mikr- micr- + Gk linein 
   to lean - more at] LEAN : a triclinic white to pale yellow, red, or green 
   mineral KAlSi3O 8 of the feldspar group that is like orthoclase in 
   composition