Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
partītor, ōris, m. [partior], a divider, distributer: cum te partitorem ad partiendas merces missum putares, Cic. Vatin. 5, 12 dub. (al. portitorem); cf. partitor, μεριστής, Gloss. Philox.