/ Dictionary / Index S semidouble: Meaning and Definition of Find definitions for: sem•i•dou•ble Pronunciation: (sem"ē-dub'ul, sem"ī-), [key] — adj. Bot. having more petals than those of a single flower but fewer than those of a double flower. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. semidominance semidry Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language