Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
hērēdĭŏlum, i, n. dim. [heredium], a small inheritance, small patrimony, Col. 1, praef. § 13; Gell. 19, 7, 1: herediolum, majorum regna meorum, Aus. Idyll. 3, 1: ex iguum, App. Mag. p. 338, 6: num ipsum heredioli pretium invidiosum est? id. ib. p. 338, 17.