Where does “tachypnoeic” come from?

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

tachypnoeic (English): Exhibiting tachypnoea; hyperventilating

Definitions

Exhibiting tachypnoea; hyperventilating

Ancestry of “tachypnoeic”, step by step

tachypnoeic traces back through two separate lines of ancestry.

via English tachypnoea

Step	Language	Word	Meaning
1	English	tachypnoea	Hyperventilation
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 →