The Collaborative International Dictionary of English v.0.48:

Drain \Drain\, n.
   1. The act of draining, or of drawing off; gradual and
      continuous outflow or withdrawal; as, the drain of specie
      from a country; the project is a drain on resources.
      [1913 Webster]

   2. That means of which anything is drained; a channel; a
      trench; a water course; a sewer; a sink.
      [1913 Webster]

   3. pl. The grain from the mashing tub; as, brewers' drains.
      [Eng.] --Halliwell.
      [1913 Webster]

   Box drain, Counter drain. See under Box, Counter.

   Right of drain (Law), an easement or servitude by which one
      man has a right to convey water in pipes through or over
      the estate of another. --Kent.
      [1913 Webster]