Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prō-cello, ĕre, v. a. [cf.: percello, procella, celer], to throw or cast down (anteclass.): procello, περιτρέπω, Gloss. Philox.: procellunt sese in mensam, i. e. lie down (at table), Plaut. Mil. 3, 1, 167 Ritschl N. cr.; cf.: procellunt, procumbunt, Paul. ex Fest. p. 225 Müll.