quadrivalent

• IPA^(key): /kwɒdrɪˈveɪlənt/

quadrivalent (not comparable)

1. (chemistry) Having a valence of four
2. (of a vaccine) Protecting against four different (usually flu) viruses.
3. (graph theory) Said of a graph: that all of its vertices have degree four.
   • 2020 January 3, Wikipedia contributors, “Knot (mathematics)”, in English Wikipedia‎, Wikimedia Foundation:

     In graph theory terms, a regular projection of a knot, or knot diagram is thus a quadrivalent planar graph with over/under-decorated vertices.

• tetravalent

• bivalent
• trivalent
• quinquivalent

quadrivalent (plural quadrivalents)

1. (genetics) Any quadrivalent chromosome

From quadri- +‎ -valent.

• IPA^(key): /kwa.dʁi.va.lɑ̃/, /ka.dʁi.va.lɑ̃/

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quadrivalent (feminine quadrivalente, masculine plural quadrivalents, feminine plural quadrivalentes)

1. quadrivalent (all senses)

• “quadrivalent”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.