/ Dictionary / Index H hd.: Meaning and Definition of Find definitions for: hd. Pronunciation: [key] hand. head. h.d. Pronunciation: [key] heavy duty. (in prescriptions) at bedtime Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. HCR hdbk. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language