cay

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cay

a small low island or bank composed of sand and coral fragments, esp in the Caribbean area
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

cay

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(geology)
A flat coral island.
A flat mound of sand built up on a reef slightly above high tide.
A small, low coastal islet or emergent reef composed largely of sand or coral.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.