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/pɹɒfəˈlæktɪk/ · noun
A medicine which preserves or defends against disease; a preventive..
The securities laws are a prophylactic against stock fraud.
Since tere are increasingly powerful anti-free speech tendencies in the left in general and in the Lesbian and Gay movements in particular in the form of the antiporn movement and other tendencies, I will quote extensively from the second chapter of On Liberty, "On The Liberty Of Thought And Discussion," as a valuable and much needed prophylactic to these trends.
Use prophylactic when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Prophylactic means A medicine which preserves or defends against disease; a preventive..
Common synonyms include preventative, safety, preventive, protective.
The opposite depends on the specific sense.
The securities laws are a prophylactic against stock fraud.
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