Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dē-runcĭno, no perf., ātum, 1, v. a. [runcina], to plane off; hence, in the lang. of comedy, to deceive, cheat; to shave (only in the foll. passages): militem, Plaut. Mil. 4, 4, 6: ego deruncinatus, deartuatus sum miser, id. Capt. 3, 4, 108.