A basin is a container that holds water and is used for washing, but you probably just call it your bathroom sink.

You can think of basinas something shaped like a bowl. If you're going for an old-fashioned ring, say "wash basin." If you’re in England, you might use a basin for cooking. The word basin also has various geological senses, particularly a depression in the ground or ocean floor. A basin is also the spot where a river drains — like the famed Mississippi River Basin. That’s one big bowl!

Definitions of basin
  1. noun
    a bowl-shaped vessel; usually used for holding food or liquids
    “she mixed the dough in a large basin
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    the basin or other vessel that holds holy water in Roman Catholic Churches
    baptismal font, baptistery, baptistry, font
    bowl for baptismal water
    a basin for washing genitals and anal area
    an ornamental basin (usually in a garden) for birds to bathe in
    emesis basin
    a basin used by bedridden patients for vomiting
    (Old Testament) large basin used by a priest in an ancient Jewish temple to perform ritual ablutions
    stoop, stoup
    basin for holy water
    handbasin, lavabo, wash-hand basin, washbasin, washbowl
    a basin for washing the hands (`wash-hand basin' is a British expression)
    type of:
    an object used as a container (especially for liquids)
  2. noun
    the quantity that a basin will hold
    synonyms: basinful
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    type of:
    the quantity that a container will hold
  3. noun
    a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face
    “he ran some water in the basin and splashed it on his face”
    synonyms: lavatory, washbasin, washbowl, washstand
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    type of:
    plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe
  4. noun
    a natural depression in the surface of the land often with a lake at the bottom of it
    “the basin of the Great Salt Lake”
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    cirque, corrie, cwm
    a steep-walled semicircular basin in a mountain; may contain a lake
    a shallow basin in a desert region; contains salt and gypsum that was deposited by an evaporated salt lake
    tidal basin
    a basin that is full of water at high tide
    type of:
    depression, natural depression
    a sunken or depressed geological formation
  5. noun
    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 basin
    synonyms: catchment area, catchment basin, drainage area, drainage basin, river basin, watershed
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    detention basin
    a storage site (such as a small reservoir) that delays the flow of water downstream
    retention basin
    a storage site similar to a detention basin but the water in storage is permanently obstructed from flowing downstream
    type of:
    geographic area, geographic region, geographical area, geographical region
    a demarcated area of the Earth
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