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From The Collaborative International Dictionary of English v.0.48:
Quinsy \Quin"sy\, n. [Contr. fr. squinancy, F. esquinancie, L. cynanche a sort of sore throat, Gr. ? sore throat, dog quinsy, fr. ? dog + ? to choke; cf. also L. synanche sore throat, Gr. ?. Cf. Hound, Anger, and Cynanche.] (Med.) An inflammation of the throat, or parts adjacent, especially of the fauces or tonsils, attended by considerable swelling, painful and impeded deglutition, and accompanied by inflammatory fever. It sometimes creates danger of suffocation; -- called also squinancy, and squinzey. [1913 Webster]