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Webster 1913 Edition

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Noun.

[L.

orthopnoea

, Gr. [GREEK];

ὀρθός

straight, right +

πνεῖν

to breathe: cf. F.

orthopnée

(Med.)

Specifically, a morbid condition in which respiration can be performed only in an erect posture; by extension, any difficulty of breathing.

Noun.

[Gr. right, erect, and breath; to breathe.]

A species of asthma in which respiration can be performed on in an erect posture.

Any difficulty of breathing.

orthopny ‎(uncountable)