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sub·mi·cro·scop·ic .səb-.mī-krə-'skäp-ik adj too small to be seen in an ordinary light microscope <\submicroscopic particles> <\submicroscopic organization of a bacterium> compare MACROSCOPIC, MICROSCOPIC (2), ULTRAMICROSCOPIC (1)
sub·mi·cro·scop·i·cal·ly -i-k(ə-)lē adv
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sub·mi·cro·scop·ic (sub″mi-kro-skopґik) too small to be visible under the light microscope.Medical dictionary. 2011.