/ Dictionary / Index H H. Doc.: Meaning and Definition of Find definitions for: H. Doc. Pronunciation: [key] House document. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. HDL HDPE Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language