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Adjective: quadrivalent  `kwód-ree'vey-lunt
  1. Having a valence of four
    "The quadrivalent vaccine was licensed in June 2006 by the FDA"
    - tetravalent

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quadrille
quadrillion
quadrillionth
quadripara
quadripartite
quadriphonic
quadriphonic system
quadriplegia
quadriplegic
quadrisonic
quadrivalent
quadrivial
quadrivium
quadroon
quadrumanous
quadrumvirate
quadruped
quadrupedal
quadruple
quadruple time
quadruplet