Quadrivalent a. : Having a valence of four; capable of combining with, being replaced by, or compared with, four monad atoms; tetravalent; -- said of certain atoms and radicals; thus, carbon and silicon are quadrivalent elements.

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Taxonomy
Quadrivalent, vaccine, dose, Human Papillomavirus Vaccine, medicines, health care professional, virus, valence, drug, side effects, tetravalent, Dictionary, cervical cancer, health care provider, non-prescription medicines, vaccine doses, Gardasil, warts.

Defination from the web:
quadrivalent adj. Chemistry Having four valences. Having a valence of four; tetravalent. quadrivalence quad ' riva ' lence or quad ' riva ' lency ... Human Papillomavirus Vaccine, Quadrivalent. Joseph Achille Le Bel (French chemist) Friedrich August Kekulé von Stradonitz (German chemist) ...