hygiene: [19] Greek hugiés meant ‘healthy’. From it were formed the noun hugíeia ‘health’ (personified as Hygieia, the Greek goddess of health) and the adjective hugieinós ‘healthful’. This came to be used as a noun, hugieiné, ‘science of healthy living’, which passed via modern Latin hygieina and French hygiène into English.
hygiene (n.)
1670s, from French hygiène, ultimately from Greek hygieine techne "the healthful art," from hygies "healthy," literally "living well" (personified as the goddess Hygieia), from PIE *eyu-gwie-es- "having a vigorous life." The Greek adjective was used by Aristotle as a noun meaning "health."