Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
omnĭmorbĭa, ae, f [omnis-morbus]. all-disease, the name of a plant regarded as a panacea: polion a Graecis, a Latinis omnimorbia, quod multis morbis subveniat, Isid. Orig. 17, 9.