The definition of hygiene is the science and practice of maintaining good health through cleanliness.(noun)
An example of hygiene is a restaurant requiring all of their employees to wash their hands after using the restroom.
See hygiene in Webster's New World College Dictionary
Origin: Fr hygiène < Gr hygieinē (technē), (art) of health < hygiēs, healthy, sound < IE *su-gwiyēs, living well < base *su-, well ( > Sans su-, well) + base *gwei-, to live > Gr bios, life, L vivus, living
See hygiene in American Heritage Dictionary 4
Origin: French hygiène
Origin: and New Latin hygieina
Origin: , both from Greek hugieinē (tekhnē), (art) of health
Origin: , feminine of hugiēs, healthy; see gwei- in Indo-European roots.
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