Launder \Laun"der\, v. t. [imp. & p. p. {Laundered} (l[add]n"d[~e]rd or l[aum]n"d[~e]rd); p. pr. & vb. n. {Laundering}.] 1. To wash, as clothes; to wash, and to smooth with a flatiron or mangle; to wash and iron; as, to launder shirts. [1913 Webster] 2. To lave; to wet. [Obs.] --Shak. [1913 Webster]