Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† chīrurgus, i, m., χειρουργός, = a surgeon, a chirurgeon (pure Lat. medicus vulnerarius), Cels. 7 praef.; Mart. 1, 31; Scrib. Comp. 201; 209 al.; Auct. Priap. 38; Inscr. Orell. 4228 al.