1. a depression in the surface of the ground, containing water.
2. a source of drinking water, as a spring or well in the desert.
3. a pond; pool.
4. a cavity containing water in the dry bed of a river.
5. a hole in the frozen surface of a lake, pond, stream, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.