Webster's English Dictionary

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microscopic

mi.cro.scop.ic or mi.cro.scop.i.cal \.mi--kr*-'ska:p-ik\ \-i-k*l\ 
   \-i-k(*-)le-\ aj usu microscopical  1: of, relating to, or conducted with 
   the microscope or microscopy  2: resembling a microscope esp. in perception 
    3a: invisible or indistinguishable without the use of a microscope  3b: 
   very small or fine  - mi.cro.scop.i.cal.ly av