Source : Webster's Revised Unabridged Dictionary (1913)

Launder \Laun"der\, v. i. [imp. & p. p. {Laundered}; 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.

   2. To lave; to wet. [Obs.] --Shak.

Laundering \Laun"der*ing\, n.
   The act, or occupation, of one who launders; washing and
   ironing.

Source : WordNet®

laundering
     n : washing clothes and bed linens