<p><strong>Noun</strong></p><ul><li>any preventive preparation used to stimulate the body’s immune response against a specific disease, using either messenger RNA or killed or weakened bacteria or viruses to prepare the body to recognize a disease and produce antibodies.</li><li>(no longer in technical use) the virus of cowpox, used in vaccination, obtained from pox vesicles of a cow or person.</li><li>a software program that helps to protect against computer viruses, as by detecting them and warning the user.</li></ul><p><strong>Adjective</strong></p><ul><li>of or relating to vaccination.</li><li>of or relating to vaccinia.</li><li>of, relating to, or derived from cows.</li></ul><p><strong>End of Response</strong></p>