Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
partĭcŭlātim, adv. [particula], part after part, bit by bit, one by one, piecemeal, singly, severally: si summatim, non particulatim narrabimus, by particulars, Auct. Her. 1, 9: grex particulatim facilius quam universus convalescit, Col. 7, 6, 5: quamvis fundus particulatim venerit, omnes partes servitus sequitur, Dig. 8, 3, 23; Varr. ap. Serv. Verg. G. 2, 267; opp. ubique, Lact. 2, 10, 23: hominem particulatim excarnefacere, Sen. Ep. 24, 13; Varr. R. R. 2 praef. § 2.