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Area or district drained; as, the drainage of the Po, the Thames, etc. Latham.

A system of natural drainage developed by the constituent streams through headwater erosion.

The draining off of water.

or light. See Blank door or window, under Blank, a. -- Blind level (Mining), a level or drainage gallery which has a vertical shaft at each end, and acts as an inverted siphon. Knight. -- Blind nettle (Bot.), dead nettle. See Dead nettle, under Dead. -- Blind shell (Gunnery), a shell containing no charge, or one th…

or noxious exhalation; as, the effluvium from diseased or putrefying bodies, or from ill drainage.

Not sanitary; unhealthy; as, insanitary conditions of drainage.

rge body of water contained in a depression of the earth's surface, and supplied from the drainage of a more or less extended area.

airs lead, iron, or glass pipes, and other apparatus for the conveyance of water, gas, or drainage in buildings.

The system of sewers in a city, town, etc.; the general drainage of a city or town by means of sewers.

Drainage of filth; filth collected from the street or highway; sewage. [Obs.] The streets were exceedingly large, well paved, having many vaults and conveyances under them for sullage. Evelyn.

A stylet, usually with a triangular point, used for exploring tissues or for inserting drainage tubes, as in dropsy. [Written also trochar.]

the opposite sides of which rain waters flow to different streams; a line separating the drainage districts of two streams or coasts; a divide.