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.
colurnus adj. for * corulnus, from corylus, of the hazel, of hazel-wood : verna, V. ...
An Elementary Latin Dictionary