Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
barbus, i, m. [barba], a barbel, a river barbel: Cyprinus barbus, Linn., Aus. Mosell. 94 and 134 (cf. barbatulus mullus, Cic. Par. 5, 2, 38, and barbati mulli, id. Att. 2, 1, 7).