Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
hĭulco, no perf., ātum, 1, v. a. [hiulcus], to cause to gape or split open, to break into chinks: cum gravis exustos aestus hiulcat agros, Cat. 68, 62: per hiulcatos agros, Fortun. Carm. 6, 12, 6.