Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
spinter (spinther), ēris, n. [prob. from σφιγκτήρ], a kind of bracelet which kept its place on the arm by its own elasticity: spinter, genus armillae quod mulieres antiquae gerere solebant bracchio summo sinistro, Fest. p. 333 Müll.: jubeas spinter novom reconcinnarier, Plaut. Men. 3, 3, 4 sq.; 4, 3, 8 sq.; 5, 2, 56; cf. Prisc. p. 646 P.