4. (noun)river basin, basin, watershed, drainage basin, catchment area, catchment basin, drainage area the entire geographical area drained by a river and its tributaries; an area characterized by all runoffbeing conveyed to the sameoutlet "flood control in the Missouri basin"
5. (noun)washbasin, basin, washbowl, washstand, lavatory a bathroomsink that is permanently installed and connected to a watersupply and drainpipe; where you can wash your hands and face "he ran some water in the basin and splashed it on his face"
3. (noun)basin a hollow vessel, of various forms and materials, used in the arts or manufactures, as that used by glass grinders for forming concave glasses, by hatters for molding a hat into shape, etc
4. (noun)basin a hollow place containing water, as a pond, a dock for ships, a little bay
5. (noun)basin a circular or oval valley, or depression of the surface of the ground, the lowest part of which is generally occupied by a lake, or traversed by a river
6. (noun)basin the entiretract of country drained by a river, or sloping towards a sea or lake
7. (noun)basin an isolated or circumscribed formation, particularly where the strata dip inward, on all sides, toward a center; -- especially applied to the coal formations, called coal basins or coalfields