Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Scaldis, is, m., the Scheldt, a river of Gallia Belgica; acc. Scaldem, Caes. B. G. 6, 33 Oud. N. cr.: Scaldim, Plin. 4, 14, 28, § 98; abl. Scalde, id. 4, 17, 31, or Scaldi, ib.