Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mūlĭōnĭcus or mūlĭōnĭus, a, um, adj. [1. mulio], of or belonging to a muledriver (class.): mulioniam paenulam arripuit, Cic. Sest. 38, 82 Halm: tectus cuculione mulionico, Lampr. Heliog. 32, 9.