Proph`y*lac"tic (?), n. [Cf. F. prophylactique.] Med.
A medicine which preserves or defends against disease; a preventive.
© Webster 1913.
Proph`y*lac"tic (?), Proph`y*lac"tic*al (?), a. [Gr. , fr. to guard against; before + to guard: cf. F. prophylactique.] Med.
Defending or preserving from disease; preventive.
Coxe.
© Webster 1913.