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English definition of “orthostatic”

orthostatic

adjective     /ˌɔː.θəʊˈstæt.ɪk/ US  /ˌɔr.θəˈstæt.ɪk/ specialized
relating to standing up straight: If you feel that your blood pressure changes because of the posture and position you are holding, you may be suffering from orthostatic hypotension.Posture
(Definition of orthostatic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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