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lavatory

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lav⋅a⋅to⋅ry

[lav-uh-tawr-ee, -tohr-ee]
–noun, plural -ries.
1. a room fitted with equipment for washing the hands and face and usually with flush toilet facilities.
2. a flush toilet; water closet.
3. a bowl or basin with running water for washing or bathing purposes; washbowl.
4. any place where washing is done.

Origin:
1325–75; ME lavatorie < LL lavātōrium washing-place, equiv. to L lavā(re) to wash + -tōrium -tory 2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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lav·a·to·ry   (lāv'ə-tôr'ē, -tōr'ē)   
n.   pl. lav·a·to·ries
  1. A room equipped with washing and often toilet facilities; a bathroom.

  2. A washbowl or basin, especially one permanently installed with running water.

  3. A flush toilet.


[Middle English, piscina, from Late Latin lavātōrium, from lavātor, launderer, from Latin lavāre, to wash; see leu(ə)- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

lavatory 
1375, "washbasin," from L. lavatorium "place for washing," noun use of neut. of adj. lavatorius "pertaining to washing," from lavatus, pp. of lavare "to wash" (see lave). Sense of "washroom" is first attested 1656; as a euphemism for "toilet, W.C.," it is attested from 1924.
Online Etymology Dictionary, © 2001 Douglas Harper
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