Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sub-dīvĭdo, īsi, īsum, 3, v. a., to subdivide (late Lat.): libros, Aug. Civ. Dei, 6, 3 med.: deinde subdivisimus, id. Trin. 3 prooem.: hebdomades, Tert. adv. Jud. 11 fin.