Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† 1. măchaera, ae, f., = μάχαιρα, a sword (ante-class. and post-Aug.): machaera atque hasta, Enn. ap Fest. s. v. redhostire, p. 270 Müll. (Trag. v. 212 Müll.): succincti corda machaeris, id. ap. Serv. ad Verg. A. 9, 678 (Ann. v. 392 ib.): eia machaeras, id. ib. 9, 38 (Ann. v. 585 ib.); Plaut. Curc. 3, 54: ni hebes machaera foret, id. Mil. 1, 1, 53; Sen. Ben. 5, 24 fin.; Suet. Claud. 15.
A weapon, in mal. part., Plaut. Ps. 4, 7, 85.