Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pransor, ōris, m. [Sanscr. prep-, pra-, before; Gr. ], one that eats breakfast, that partakes of a meal in the forenoon, a guest (ante-class.): bonum anteponam prandium pransoribus, Plaut. Men. 2, 2, 2: cum jam manus pransores lavarent, Veran. ap. Macr. S. 3, 6, 14.