noun.
The science that deals with the promotion and preservation of health.
noun.
Conditions and practices that serve to promote or preserve health.
The Century Dictionary and Cyclopedia
noun.
That department of medical knowledge which concerns the preservation of health; a system of principles or rules designed for the promotion of health; sanitary science.
the GNU version of the Collaborative International Dictionary of English
noun.
That department of sanitary science which treats of the preservation of health, esp. of households and communities; a system of principles or rules designated for the promotion of health.