Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
nostras, ātis (old form of the nom. sing. nostratis, Cass. Hem. ap. Prisc. p. 943 P.), adj. [noster], of our country, native: arma nostratia, Cato ap. Prisc. p. 943 P.: verba nostratia, Cic. Fam. 2, 11, 1: mirifice capior facetiis, maxime nostratibus, id. ib. 9, 15, 2: nostrates philosophi, id. Tusc. 5, 32, 90: tertium genus nostrates vocant silvestre, Plin. 16, 16, 28, § 70: nostras cunila, Col. 9, 4, 6: nostrates gallinae, id. 8, 2, 13; Plin. 15, 11, 10, § 37.