the prevention of a specific disease, as by studying the biological behavior, transmission, etc., of its causative agent and applying a series of measures against it.
2.
prophylactic treatment, as the cleaning of the teeth by a dentist or dental hygienist.
Origin: 1835–45; < Neo-Latin < Greek pro-pro-2 + phýlaxis a watching, guarding, equivalent to phylak- (base of phylássein to guard) + -sis-sis