/ Dictionary / Index M myxasthenia: Meaning and Definition of Find definitions for: myx•as•the•ni•a Pronunciation: (mik"sus-thē'nē-u, mik-sas"thu-nī'u), [key] — n. Pathol. defective secretion of mucus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. myxameba myxedema Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language