/ Dictionary / Index H hortus siccus: Meaning and Definition of Find definitions for: hor•tus sic•cus Pronunciation: (hôr'tus sik'us), [key] a collection of dried plants; herbarium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. horticulture hor. un. spatio Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language