Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
văpōrōsus, a, um, adj. [vapor-fero], full of steam or vapor, steaming, vaporous (postclass.): caligo, App M. 9, p. 222, 31: fontes balnearum, id. ib. 5, p. 165, 24.