Definition of well-room in US English:

well-room

noun

  • 1A room enclosing a well and its apparatus.

  • 2A room or building at a spa containing the well from which the medicinal water is dispensed.

  • 3Nautical. A compartment in the bottom of a boat or ship housing pumps or suction pipes, in which bilge water collects.

Origin

Mid 17th century; earliest use found in John Lightfoot (1602–1675), Hebraist and biblical scholar. From well + room.