Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† gymnĭcus, a, um, adj., = γυμνικός, of or for bodily exercise, gymnastic: ludi qui gymnici nominantur, Cic. Tusc. 2, 26, 62: ludi, Plin. 7, 56, 57, § 205: certamina, Suet. Ner. 53.