Lewis & Short

ŏbustus, a, um, Part. [ob-uro].

  1. I. Lit., burnt around, burnt, hardened in the fire (poet.): hic torre armatus obusto, Verg. A. 7, 506: sudes, id. ib. 11, 894.
  2. II. Transf.: glaeba gelu, burnt by frost. Ov. Tr. 5, 2, 66.