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Meaning of atoll

at•oll

Pronunciation: (at'ôl, -ol, -ōl, u-tôl', u-tol', u-tōl'), [key]
— n.
  1. a ring-shaped coral reef or a string of closely spaced small coral islands, enclosing or nearly enclosing a shallow lagoon.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
at. no. atom