tombolo

[tom-buh-loh]
noun, plural tombolos.
a sand bar connecting an island to the mainland or to another island.

Origin:
1899; < Italian < Latin tumulus mound. See tumulus

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World English Dictionary
tombolo (ˈtɒmbəˌləʊ)
 
n , pl -los
a narrow sand or shingle bar linking a small island with another island or the mainland
 
[C20: from Italian, from Latin tumulus mound; see tumulus]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
tombolo   (tŏm'bə-lō')  Pronunciation Key 
A sand or gravel bar that connects an island to the mainland or to another island.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

tombolo

one or more sandbars or spits that connect an island to the mainland. A single tombolo may connect a tied island to the mainland, as at Marblehead, Mass. A double tombolo encloses a lagoon that eventually fills with sediment; fine examples of these occur off the coast of Italy. The shallower waters that occur between an island and the mainland are the loci of such features because sandbars form there.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
When it was connected to the island it was a tombolo.
Include the county-owned tidelands south of the tombolo in the long-term boundary.
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