/ Dictionary / Index M myosis: Meaning and Definition of Find definitions for: my•o•sis Pronunciation: (mī-ō'sis), [key] — n. Med. miosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: myosis (Thesaurus) myosin myosotis Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language