| Quadrin | n. [ OF., fr. L. quadrini four each, fr. quattuor four. ] A small piece of money, in value about a farthing, or a half cent. [ Obs. ] [ 1913 Webster ] |
| Quadrinodal | a. [ Quadri- + nodal. ] (Math.) Possessing four nodes; |
| Quadrinomial | n. [ Quadri- + nomial, as in binomial: cf. F. quadrinôme. ] (Alg.) A polynomial of four terms connected by the signs plus or minus. [ 1913 Webster ] |
| Quadrinomical | a. Quadrinomial. [ 1913 Webster ] |
| Quadrinominal | a. [ Quadri- + nominal. ] (Alg.) Quadrinomial. Sir W. R. Hamilton. [ 1913 Webster ] |