Where does “orthopneic” come from?

orthopneic (English) comes from English orthopnea, from English -pnea, from Ancient Greek -πνοια, from Ancient Greek πνοή, from Ancient Greek -ή, from Ancient Greek -ᾱ, from Proto-Indo-European -éh₂.

orthopneic (English): Of or relating to orthopnea—a morbid condition in...

Definitions

Of or relating to orthopnea—a morbid condition in...

Ancestry of “orthopneic”, step by step

orthopneic traces back through two separate lines of ancestry.

via English orthopnea

Step	Language	Word	Meaning
1	English	orthopnea	Alternative spelling of orthopnoea
2	English	-pnea	breathing, respiration
3	Ancient Greek	-πνοια	—
4	Ancient Greek	πνοή	breath
5	Ancient Greek	-ή	suffix of feminine nouns in the [[Appendix:Ancient Greek first declension
6	Ancient Greek	-ᾱ	nominal suffix
7	Proto-Indo-European	-éh₂	—

via English ic

Step	Language	Word	Meaning
1	English	ic	related or pertaining to; having the character of

Every word from Proto-Indo-European -éh₂ →Every word from Ancient Greek -ή →Every word from Ancient Greek -ᾱ →