1 a small body of still water, usually fresh; small pond
2 a small isolated collection of liquid spilt or poured on a surface; puddle
a pool of blood
3 a deep part of a stream or river where the water runs very slowly
4 an underground accumulation of oil or gas, usually forming a reservoir in porous sedimentary rock
5 See →
(Old English pol; related to Old Frisian pol, German Pfuhl)
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"