The Collaborative International Dictionary of English v.0.48:
Powdering \Pow"der*ing\, a. & n. from Powder, v. t. [1913 Webster] Powdering tub. (a) A tub or vessel in which meat is corned or salted. (b) A heated tub in which an infected lecher was placed for cure. [Obs.] --Shak. [1913 Webster]