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There are 2 twelve-letter words containing RIVALEN

QUADRIVALENTquadrivalent adj. (Chemistry) Having a valence of four.
quadrivalent adj. (Of a vaccine) Protecting against four different (usually flu) viruses.
quadrivalent adj. (Graph theory) Said of a graph: that all of its vertices have degree four.
TRIVALENCIESTRIVALENCY n. the state of being trivalent, also TERVALENCY, TRIVALENCE.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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