Webster's English Dictionary

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launder

1. laun.der \'lo.n-d*r, 'la:n-\ n [ME, launderer, fr. MF lavandier, fr. ML 
   lavandarius, fr. L lava]ndus, gerundive of lavare to wash - more at LYE : 
   TROUGH; specif : a box conduit conveying middlings or tail ings suspended 
   in water in ore dressing
2. launder \-d(*-)rin\ \-d*r-*r, -dr*r\ \-dr*s\ vb or laun.der.ing [ME 
   launder, n.,] 1: to wash (as clothes) in water  2: to iron after washing {a 
   freshly ~ed shirt}  1: to wash or wash and iron clothing or household 
   linens  2: to withstand washing and ironing  - laun.der.er n