Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Sŭbūra, ae (abbrev. SVG.; v. infra), f., a quarter in Rome, in the second region, between the Esquiline, Viminal, and Quirinal, where provisions were sold, and where many prostitutes dwelt: Subura Junius scribit ab eo, quod fuerit sub antiquā Urbe: quoi testimonium potest esse, quod subest ei loco, qui Terreus murus vocatur. Sed ego a pago potius Succusano dictam puto Succusam, quod in notā etiam nunc scribitur tertia littera C, non B, Varr. L. L. 5, § 48 Müll.; cf.: Subura cum tribus litteris notatur, C litteram ostendit, Quint. 1, 7, 29; cf. Fest. p. 309 Müll.; Liv. 3, 13; Mart. 6, 66, 2; 7, 31, 12; 10, 94, 5: clamosa, id. 12, 18, 2; Pers. 5, 32; Juv. 11, 141 (v. Subura, Becker, Antiq. vol. 1, p. 521 sq.; and cf. id. Gall. vol. 3, p. 44, 2d ed.).
Hence,