Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dē-mĕo, āre, v. n., to go down, descend (post-class.); caelo, Ap. M. 10, p. 254, 12: ad Tartarum Manesque, id. ib. 6, p. 180, 7; Mart. Cap. 2, p. 38.