/ Dictionary / Index M Memnonia: Meaning and Definition of Find definitions for: Mem•no•ni•a Pronunciation: (mem-nō'nē-u), [key] — n. an area in the southern hemisphere of Mars, appearing as a light region when viewed telescopically from the earth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Memnon memo Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language