{ 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.