/ Dictionary / Index H hor. som.: Meaning and Definition of Find definitions for: hor. som. Pronunciation: [key] (in prescriptions) at bedtime. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. horsily horst Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language