Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* gerro, (archaic orthogr.: ‡ cerrones leves et inepti, Paul. ex Fest. v. p. 40 Müll.), ōnis, m. [gerrae], a trifler, idle fellow: gerro, iners, fraus, heluo, Ganeo, damnosus! Ter. Heaut. 5, 4, 10.