WordWeb Online

1. Public electricity, gas or water supply to a house or building
   "turn on the mains"; "Working on the mains water supply"

1. Any very large body of (salt) water
   - briny [Brit]
    
2. A principal pipe in a system that distributes water, gas, electricity or that collects sewage
    
3. The lowermost sail on the mainmast
   - mainsail

Sounds like: main, mane, Maains, m

Type of: body of water, canvas, canvass, pipage, pipe, piping, sail, sheet, water

Part of: base, hydrosphere, infrastructure

Encyclopedia: Mains, electric power