Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cŏlurnus, a, um, adj. [transp. for corulnus, from corulus = corylus], made of the hazel-bush: verna, Verg. G. 2, 396 Serv.; cf. Prisc. p. 595 P.: hastilia, Paul. ex Fest. p. 37, 7 Müll.