Definitions of quadrivalent:
  • adjective:   (chemistry) Having a valence of four
  • adjective:   (of a vaccine) Protecting against four different (usually flu) viruses.
  • adjective:   (graph theory) Said of a graph: that all of its vertices have degree four.
  • noun:   (genetics) Any quadrivalent chromosome

(Definitions from Wiktionary)

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