hygieio-, hygiei-, hygio-, hygi- +

(Greek: health, healthy, healthful, wholesome, sound [in body])

hygiology
The science of health; hygiene.
unhygienic, unhygienically
Not sanitary nor healthy.

Related "health" word families and articles: Health: Index; Hygeia > hygiene > health; iatro-, -iatrician; salu-; sana-, sani-.