Etymology
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lavatory (n.)

late 14c., "washbasin," from Late Latin lavatorium "place for washing," noun use of neuter of Latin adjective lavatorius "pertaining to washing," from lavat-, past participle stem of lavare "to wash," from PIE root *leue- "to wash." Sense of "washroom" is first attested 1650s; as a euphemism for "toilet, W.C.," it is attested by 1864. Related: Lavatorial.

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Definitions of lavatory

lavatory (n.)
a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face;
Synonyms: washbasin / basin / washbowl / washstand
lavatory (n.)
a toilet that is cleaned of waste by the flow of water through it;
Synonyms: flush toilet
lavatory (n.)
a room or building equipped with one or more toilets;
Synonyms: toilet / lav / can / john / privy / bathroom
From wordnet.princeton.edu