/ Dictionary / Index M MLD: Meaning and Definition of Find definitions for: MLD Pronunciation: [key] median lethal dose. minimum lethal dose. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. MLB Mleccha Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language