/ Dictionary / Index H Hidatsa: Meaning and Definition of Find definitions for: Hi•dat•sa Pronunciation: (hē-dät'sä), [key] — pl. -sas, -sa a member of a Siouan people dwelling on the Missouri River. the Siouan language of the Hidatsa tribe. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hidatsa (Thesaurus) Hidalgo y Costilla hidden Related Content Daily Word Quiz: prevalent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language