/ Dictionary / Index S submicron: Meaning and Definition of Find definitions for: sub•mi•cron Pronunciation: (sub-mī'kron), [key] — adj. (of particles) being less than a micron in overall dimensions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. submetallic submicroscopic 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