noun
A wide bowl for washing, sometimes affixed to a wall.
(obsolete) A shallow bowl used for a single serving of a drink or liquidy food.
A depression, natural or artificial, containing water.
(geography) An area of land from which water drains into a common outlet; drainage basin.
(geography) A shallow depression in a rock formation, such as an area of down-folded rock that has accumulated a thick layer of sediments, or an area scooped out by water erosion.
verb
To create a concavity or depression in.
To serve as or become a basin.
To shelter or enclose in a basin.