- The definition of a cay is a sand bar or small island made up or sand or coral.
An example of a cay is Sand Key in the Florida Keys.
cay definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a low island, coral reef, or sandbar
Origin: Spanish cayo
cay definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A small, low island composed largely of coral or sand.
Origin: Alteration (influenced by quay) of Spanish cayo, probably from Taino.
cay - Science Definition
A small, low island composed largely of coral or sand. Also called key.