Dictionary![]() ![]() Hi•dat•saPronunciation: (hē-dät'sä), [key] —n., —pl. -sas, (esp. collectively) -sa for 1. 1. a member of a Siouan people dwelling on the Missouri River. 2. the Siouan language of the Hidatsa tribe. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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