Etymology of the English word prophylaxis
the English word prophylaxis
derived from the New Latin word prophylaxis
derived from the Greek word prophulaktikos, προφυλακτικός, προϕυλακτικός
derived from the Greek word prophulassein, προφυλάσσειν, προϕυλάσσω
using the Greek prefix pro-, προ- (before)
derived from the Greek word phulasso, φυλάσσω (to watch; be on guard (literally of figuratively); by implication, to preserve, obey, avoid)