Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Albis, is, m. [v. albus], a river of Germany, now the Elbe, Tac. G. 41; id. A. 4, 44: Albin liquere Cherusci, Claud. IV. Cons. Hon. 452.
Also Alba, ae, m., Vop. Prob. 13.