Etymology
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hygiene (n.)

1670s, from French hygiène, ultimately from Greek hygieine techne "the healthful art," from hygies "healthy, sound, hearty," literally "living well" (personified as the goddess Hygieia), from PIE *eyu-gwie-es- "having a vigorous life," from root *aiw-, *ayu- "vital force, life, long life, eternity; in the prime of life, young" (source of Latin aevus, English ever). The Greek adjective was used by Aristotle as a noun meaning "health." The difficult spelling in English is a relic of the struggle to render the Greek vowels into French.

updated on December 14, 2017

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Definitions of hygiene from WordNet

hygiene (n.)
a condition promoting sanitary practices;
personal hygiene
hygiene (n.)
the science concerned with the prevention of illness and maintenance of health;
Synonyms: hygienics
From wordnet.princeton.edu, not affiliated with etymonline.