/ Dictionary / Index O orthostates: Meaning and Definition of Find definitions for: or•thos•ta•tes Pronunciation: (ôr-thos'tu-tēz"), [key] — pl. -tai orthostat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthostat orthostatic Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language