/ Dictionary / Index M Miass: Meaning and Definition of Find definitions for: Mi•ass Pronunciation: (mē-äs' Russ. myi-äs'), [key] — n. a city in the S Russian Federation in Asia, near the Ural Mountains, W of Chelyabinsk. 150,000. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. miasma miazine Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language