Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
fulgĭdus, a, um, adj. [fulgeo], flashing, glittering, shining (ante- and post-class.): lumina, Lucr. 3, 363: acies ornatu fulgida Martis, Claud. in Ruf. 2, 351; Anthol. Lat. 5, 41, 15.
Comp.: fulgidier radio, Ven. Carm. 8, 5 fin.