Etymology
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prophylaxis (n.)

"preventive treatment of disease, a guarding against the attack of some disease," 1746, Modern Latin, from Greek prophylassein "to keep guard before," from pro "before" (see pro-) + phylassein "to watch over, guard" (see prophylactic).

updated on December 11, 2020

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Definitions of prophylaxis from WordNet

prophylaxis (n.)
the prevention of disease;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.