Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sur-rīdĕo (subr-), si, 2, v. n., to smile (rare but class.): surridet Saturius veterator, * Cic. Rosc. Com. 8, 22: limis surrisit ocellis, Ov. Am. 3, 1, 33: surridens Mezentius, Verg. A. 10, 742: modice, Mart. 6, 82, 7: molle, Pers. 3, 110; Varr. R. R. 3, 2, 2; Claud. in Eutr. 2, 108.