The Collaborative International Dictionary
Right of drain
Drain \Drain\, n.
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.
That means of which anything is drained; a channel; a trench; a water course; a sewer; a sink.
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pl. The grain from the mashing tub; as, brewers' drains. [Eng.]
--Halliwell.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.