The Collaborative International Dictionary
Prophylactical
Prophylactic \Proph`y*lac"tic\, Prophylactical
\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.
Wiktionary
prophylactical
a. prophylactic; preventative