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or·tho·stat·ic .ȯr-thə-'stat-ik adj of, relating to, or caused by erect posture <\orthostatic hypotension>
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adj.
relating to the upright position of the body: used when describing this posture or a condition caused by it. Orthostatic hypotension, for example, is low blood pressure found in some patients when they stand upright.
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or·tho·stat·ic (or″tho-statґik) [ortho- + -static] pertaining to or caused by standing erect.Medical dictionary. 2011.