O / ob-tentĭo
noun

ob-tentĭo

gen. ob-tentōnis · gender feminine · decl. 3rd
a covering; veiling;; obscurity
a covering, veiling; trop., obscurity, darkness (postclass.): aliquid obtentionibus allegoricis claudere, by an allegorical dress, Arn. 5, 181; 5, 182.