Lewis & Short

ob-ductĭo, ōnis, f. [obduco], a covering, veiling, enveloping.

  1. * I. In gen.: nubila inimica obductione pendent, Arn. 1, 7.
  2. II. In partic., a veiling of criminals before their execution: obductio capitis, Cic. Rab. Perd. 5, 16: capitum, Amm. 14, 7, 21; Vulg. Eccles. 5, 1; 5, 10.