WordReference Random House Learner's Dictionary of American English © 2020
ˈpow•der ˌroom, n. 
  • ladies' room.

  • WordReference Random House Unabridged Dictionary of American English © 2020
    powder room′, 
    1. a room containing a toilet and washing facilities for women;
    2. such a room provided for the use of female guests, as in a restaurant or nightclub.
    • 1905–10

    Collins Concise English Dictionary © HarperCollins Publishers::
    powder room n
    1. euphemistic a lavatory for women in a restaurant, department store, etc
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