[awr-thop-nee-uh, awr-thop-nee-uh, -thuhp-]
noun Pathology.
difficult or painful breathing except in an erect sitting or standing position.
Also, orthopnoea.

1650–60; < Greek orthópnoia, equivalent to orthópno(os) breathing upright (ortho- ortho- + pno() breath + -os adj. suffix) + -ia -ia

orthopneic, orthopnoeic, adjective
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American Heritage
Medical Dictionary

orthopnea or·thop·ne·a (ôr'thŏp-nē'ə, ôr-thŏp'nē-ə)
Discomfort in breathing that is relieved by sitting or standing in an erect position.

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
Unlike orthopnea, symptoms are not relieved by sitting up.
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