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quadrinomial

From The Collaborative International Dictionary of English v.0.48:

Quadrinomial \Quad`ri*no"mi*al\, n. [Quadri- + nomial, as in
   binomial: cf. F. quadrin[^o]me.] (Alg.)
   A polynomial of four terms connected by the signs plus or
   minus.
   [1913 Webster]

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