water closet

noun
1.
an enclosed room or compartment containing a toilet bowl fitted with a mechanism for flushing.
2.
Older Use. a privy or bathroom.
Abbreviation: WC, w.c.
Origin
1745-55
Examples from the web for water closet
  • Pour five gallons of sodium hydroxide solution into the piping rapidly enough to simulate the flushing, action of a water closet.
  • Toilet rooms in excess of one water closet or containing one water closet and one urinal require a trap primed floor drain.
British Dictionary definitions for water closet

water closet

noun
1.
a lavatory flushed by water
2.
a small room that has a lavatory
Usually abbreviated to WC