1815, from French hygiénique (1812), from hygiène (see hygiene). The earlier adjective was hygienal (1660s). Related: Hygienics (1836).
hygienic habits like using disposable tissues
hygienic surroundings with plenty of fresh air
Hydrus
hyena
hyetal
hyeto-
hygiene
hygienic
hygienist
hygro-
hygrology
hygrometer
hygroscope
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