Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mĕdĭcīnālis, e, adj. [medicina], of or pertaining to medicine, medical, medicinal (not ante-Aug.): ars, Cels. praef.: cucurbitulae, cupping-glasses, Plin. 32, 10, 42, § 123: mortarium, id. 36, 22, 43, § 157: scalprum, Scrib. Compos. 53: digitus, the next to the little finger, Macr. S. 7, 13.