/ Dictionary / Index S submicroscopic: Meaning and Definition of Find definitions for: sub•mi•cro•scop•ic Pronunciation: (sub"mī-kru-skop'ik), [key] — adj. too small to be seen through a microscope. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. submicron submillimeter Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language