คำว่า ' drainage ' ( N )
มีความหมายในภาษาไทยว่า การระบายน้ำ
คำนิยามในภาษาอังกฤษ (definition) :
[n.] A draining; a gradual flowing off of any liquid; also, that which flows out of a drain.
[n.] The mode in which the waters of a country pass off by its streams and rivers.
[n.] The system of drains and their operation, by which superfluous water is removed from towns, railway beds, mines, and other works.
[n.] Area or district drained; as, the drainage of the Po, the Thames, etc.
[n.] The act, process, or means of drawing off the pus or fluids from a wound, abscess, etc.