prophylactic

/P R AA0 F IH0 L AE1 K T IH0 K/
noun
  1. 1

    A medicine which preserves or defends against disease; a preventive.

  2. 2

    Any device or mechanism intended to prevent harmful consequences.

    โ€œThe securities laws are a prophylactic against stock fraud.โ€

adjective
  1. 1

    Serving to prevent or protect against an undesired effect, especially disease.

Source: https://en.wiktionary.org/wiki/prophylactic