Webster's English Dictionary

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lavatory

lav.a.to.ry \'lav-*-.to-r-e-, -.to.r-\ n [ME lavatorie, fr. ML lavatorium, 
   fr. L lavatus, pp. of la]vare to wash - more at LYE 1: a basin or other 
   vessel for washing : as  1a: PISCINA  1b: a fixed bowl or basin with 
   running water and drainpipe for washing  2: a room with conveniences for 
   washing and usu. with one or more toilets  3: WATER CLOSET  - lavatory aj