English
eupnea
From eu- + -pnea.
A compound of eu- + -pnea
Proto-Indo-European *h₁su- ‘good’
Proto-Hellenic *ehu- ‘good’
Ancient Greek ἐΰς ‘good, brave, noble’
Ancient Greek εὖ ‘well, good’
English eu-
Today it means
noun Normal, relaxed breathing; healthy condition of inhalation and exhalation.
Language periods are conventional ranges, not dates for this word.
Etymograph / eupnea