orthostatic

[awr-thuh-stat-ik]
adjective
relating to or caused by erect posture.

Origin:
1900–05; ortho- + static

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American Heritage
Medical Dictionary

orthostatic or·tho·stat·ic (ôr'thə-stāt'ĭk)
adj.
Relating to or caused by standing upright, as hypertension.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Prior to re-entry to gravity, increasing fluid intake is helpful in minimizing the effects of orthostatic hypotension.
Orthostatic hypotension, a sudden drop in blood pressure when standing, can occur and increases the risk of falling.
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