Lewis Short
(verb) : oppando, pandi, pansum, or passum, 3, ob-pando
* To spread or stretch out against or before, to spread out (post-class.): aliquid ad flatus helices,Grat. Cyn. 55: cornibus oppansis et summā fronte coruscum (of the cross of Christ),Prud. Psych. 410: aulaei vice oppansā,Tert. Apol. 48 fin.; Hier. Ep. ad Galat. 1, v. 11, 12; Vulg. Exod. 35, 12.—Hence, oppansum (-passum), i, n., a covering, envelope (eccl. Lat.): corporis,Tert. Anim. 53.
Charlton T. Lewis, Charles Short, A Latin Dictionary