(n.) The art of preserving from, or of preventing, disease; the observance of the rules necessary for the preservation of health; preservative or preventive treatment.

active treatment adjuvant treatment antigen treatment causal treatment conservative treatment cross-firing diathermic treatment dietetic treatment drip treatment drug treatment empiric treatment epidemiology expectant treatment fever treatment health physics heat treatment hot-air treatment hygiene hygienics light treatment mental hygiene palliative treatment perennial treatment preseasonal treatment preventive dentistry preventive medicine preventive treatment prophylactic psychology prophylactodontia prophylaxy public health radiotherapeutic treatment rational treatment sanitation shock treatment specific treatment starvation treatment supporting treatment surgical treatment symptomatic treatment tonic treatment vibration treatment