Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sur-rūfus (subr-), a, um, adj., somewhat reddish: color, Plin. 37, 10, 61, § 170: surrufus aliquantum, red-haired, Plaut. Capt. 3, 4, 115.