Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ventĭlābrum, i, n. [ventilo], an implement for winnowing grain, a winnowing-fork, Col. 2, 10, 14; Prud. Apoth. praef. 2, 53; Vulg. Matt. 3, 12; Ambros. in Psa. 118, Serm. 3, n. 15.