1. quadrivalent - Noun
2. quadrivalent - Adjective
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.
Source: Webster's dictionaryLAIV is live attenuated influenza vaccine, available as a quadrivalent formulation (LAIV4). Source: Internet
The CDC recommends the quadrivalent preparation. Source: Internet