/ Dictionary / Index L LDH: Meaning and Definition of Find definitions for: LDH Pronunciation: [key] lactate dehydrogenase. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ldg. LDL Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language