: a pool left (as in a rock basin) by an ebbing tide — compare beach pool
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tide pool,
a pool of water left by a receding tide: »
Tide pools…where all the beauty of the sea is…portrayed in miniature (Rachel Carson).
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noun, pl ⋯ pools [count]
US : an area of water that is left on a beach after the tide has fallen
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a small amount of water that collects between the rocks by the sea/ocean 
See also: ↑rock pool
Useful english dictionary. 2012.