/ Dictionary / Index M myria-: Meaning and Definition of Find definitions for: myria- Pronunciation: [key] a combining form meaning “10,000,” used esp. in the names of metric units equal to 10,000 of the unit denoted by the base word: myriagram; myriameter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Myrdal myriad Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language