/ Dictionary / Index O orthostatic: Meaning and Definition of Find definitions for: or•tho•stat•ic Pronunciation: (ôr"thu-stat'ik), [key] relating to or caused by erect posture. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: orthostatic (Thesaurus) orthostates orthostatic hypotension 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