Source : Webster's Revised Unabridged Dictionary (1913)

Hygienic \Hy`gi*en"ic\, a. [Cf. F. hygi['e]nique.]
   Of or pertaining to health or hygiene; sanitary.

Source : WordNet®

hygienic
     adj : tending to promote or preserve health; "hygienic habits like
           using disposable tissues"; "hygienic surroundings with
           plenty of fresh air" [syn: {hygienical}]