Webster's English Dictionary

Enter the word to look up:

mica

mi.ca \'mi--k*\ \mi--'ka--sh*s\ n [NL, fr. L, grain, crumb; akin to Gk 
   mikros small - more at MICR-] often attrib  : any of various colored or 
   transparent mineral silicates crystallizing in  monoclinic forms that 
   readily separate into very thin leaves - mi.ca.ceous aj