There are 2 definitions of loo in English:

loo1

Syllabification: loo
Pronunciation: /lo͞o
 
/

noun

British informal
A bathroom or toilet.
More example sentences
  • The second option was to cut services: scale back dustbin emptying, close more public loos or stop sweeping the streets, for instance.
  • There are far too few accessible public loos in our town centres and the one in the car park is the only reliable convenience with a reasonable standard of cleanliness.
  • He feared there was a Government agenda to pension off public loos because councils did not have a duty to provide them, and closure kept council tax bills down.

Origin

1940s: many theories have been put forward about the word's origin: one suggests the source is Waterloo, a trade name for iron cisterns in the early part of the century; the evidence remains inconclusive.

Definition of loo in:

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There are 2 definitions of loo in English:

loo2

Syllabification: loo
Pronunciation: /
 
lo͞o/

noun

A gambling card game, popular from the 17th to the 19th centuries, in which a player who fails to win a trick must pay a sum to a pool.

Origin

late 17th century: abbreviation of obsolete lanterloo, from French lanturlu, a meaningless song refrain.

Definition of loo in: