[lawn-der, lahn-]
verb (used with object)
to wash (clothes, linens, etc.).
to wash and iron (clothes).
to disguise the source of (illegal or secret funds or profits), usually by transmittal through a foreign bank or a complex network of intermediaries.
to disguise the true nature of (a transaction, operation, or the like) by routing money or goods through one or more intermediaries.
to remove embarrassing or unpleasant characteristics or elements from in order to make more acceptable: He'll have to launder his image if he wants to run for office.
verb (used without object)
to wash laundry.
to undergo washing and ironing: The shirt didn't launder well.
(in ore dressing) a passage carrying products of intermediate grade and residue in water suspension.
Metallurgy. a channel for conveying molten steel to a ladle.

1300–50; 1970–75 for def 3; Middle English: launderer, syncopated variant of lavandere, lavendere washer of linen < Middle French lavandier(e) < Medieval Latin lavandārius (masculine), lavandāria (feminine), equivalent to Latin lavand- (gerund stem of lavāre to wash) + -ārius, -āria -ary; see -er2)

launderable, adjective
launderability, noun
launderer, noun
relaunder, verb (used with object)
unlaundered, adjective
well-laundered, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
launder (ˈlɔːndə)
1.  to wash, sometimes starch, and often also iron (clothes, linen, etc)
2.  (intr) to be capable of being laundered without shrinking, fading, etc
3.  (tr) to process (something acquired illegally) to make it appear respectable, esp to process illegally acquired funds through a legitimate business or to send them to a foreign bank for subsequent transfer to a home bank
4.  a water trough, esp one used for washing ore in mining
[C14 (n, meaning: a person who washes linen): changed from lavender washerwoman, from Old French lavandiere, ultimately from Latin lavāre to wash]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"to wash linen," 1660s; see laundry. Criminal banking sense first recorded 1961, from notion of making dirty money seem clean; brought to widespread use during U.S. Watergate scandal, 1973. Related: Laundered; laundering.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Wash your hands thoroughly and launder clothes separately after completing the
It is better to do a floor to ceiling cleaning and launder everything.
The also conspire to channel, siphon and launder millions of dollars worth of
  grant money from the government.
The also conspire to channel, syphon and launder millions of dollars worth of
  grant money from the government.
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