[1] : The Collaborative International Dictionary of English v.0.48

cay \cay\, n.
   see key, a ledge.
   1913 webster
see also:
key 

[2] : WordNet (r) 2.0

cay
     n : a coral reef off the southern coast of florida syn: key,
         florida keys
see also:
key florida keys 

[3] : Moby Thesaurus II by Grady Ward, 1.0

20 moby thesaurus words for "cay":
   ait, archipelago, atoll, bar, continental island, coral head,
   coral island, coral reef, holm, insularity, island, island group,
   islandology, isle, islet, key, oceanic island, reef, sandbank,
   sandbar

Cay >> C Words
Cay, definition of term: Cay
cay_pag1.html