/ Dictionary / Index S semiarid: Meaning and Definition of Find definitions for: sem•i•ar•id Pronunciation: (sem"ē-ar'id, sem"ī-), [key] — adj. characterized by very little annual rainfall, usually from 10 to 20 in. (25 to 50 cm): the struggle to raise vegetables in semiarid regions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: semiarid (Thesaurus) semiarch semiautobiographical Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language