Pronunciation: (prō"fu-lak'sis, prof"u-), [key]
a. the preventing of disease.
b. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.