American Heritage Dictionary
(3)
Century Dictionary
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GNU Webster's 1913
(1)
WordNet
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Elsewhere on the web
Just one case: The noun preservatief ` preservative 'has gone in Holland the same way as Shroat's prophylactic, only more so.— VERBATIM: The Language Quarterly Vol VII No 2
And I cannot believe that many persons are aware that the word prophylactic, defined as ` preventive of disease, 'may just as properly be used to describe the kind of rubbers your mother made you wear in the rain as the devices the army used to distribute for the protection of promiscuous privates.— VERBATIM: The Language Quarterly Vol VI No 4
Prophylactic has been looked up 182 times, favorited once, listed 31 times, and commented on twice.

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word several times a year.
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