Definition of hygiene noun from the Oxford Advanced Learner's Dictionary

 

hygiene

 noun
noun
BrE BrE//ˈhaɪdʒiːn//
 
; NAmE NAmE//ˈhaɪdʒiːn//
 
[uncountable]
 
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the practice of keeping yourself and your living and working areas clean in order to prevent illness and disease food hygiene personal hygiene In the interests of hygiene, please wash your hands. Word Origin late 16th cent.: via French from modern Latin hygieina, from Greek hugieinē (tekhnē) ‘(art) of health’, from hugiēs ‘healthy’.Extra examples Many skin diseases can be prevented by good personal hygiene. The restaurant was in breach of food hygiene regulations. children with poor hygiene habits feminine/​personal hygiene products infections that are the result of poor food hygiene
See the Oxford Advanced American Dictionary entry: hygiene