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Noun: drainage basin  'drey-nij'bey-sun
  1. The entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet
    "flood control in the Missouri drainage basin";
    - river basin, basin, watershed, catchment area, catchment basin, drainage area

Derived forms: drainage basins

Type of: geographic area, geographic region, geographical area, geographical region

Encyclopedia: Drainage basin