Lewis Short
(verb) : ustŭlo, āvi, ātum, 1, id..
* Lit.
* In gen., to burn a little, to scorch, singe (very rare; syn. amburo): palos,Vitr. 5, 12: taleas oleagineas,id. 1, 5: caput ferventi ferro,i. e. to crisp the hair,Auct. Priap. 46.—*
* Transf., to pinch, nip, or blast with cold: gemmas (arboris) frigoris aurā,Auct. Priap. 62.
Charlton T. Lewis, Charles Short, A Latin Dictionary