Dictionary.com
Thesaurus.com

orthopnea

American  
[awr-thop-nee-uh, awr-thop-nee-uh, -thuhp-] / ɔrˈθɒp ni ə, ˌɔr θɒpˈni ə, -θəp- /
Or orthopnoea

noun

Pathology.
  1. difficult or painful breathing except in an erect sitting or standing position.


Other Word Forms

Etymology

Origin of orthopnea

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