Stoup \Stoup\ (st[=oo]p), n. [See {Stoop} a vessel.] 1. A flagon; a vessel or measure for liquids. [Scot.] --Jamieson. [1913 Webster] 2. (Eccl.) A basin at the entrance of Roman Catholic churches for containing the holy water with which those who enter, dipping their fingers in it, cross themselves; -- called also {holy-water stoup} or {holy-water font}. [1913 Webster]