from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A sandbar that connects an island to the mainland or to another island.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A spit of sand linking an island to the mainland (or to another island), formed by longshore drift.
from The Century Dictionary and Cyclopedia
- n. A sand-reef by which an island is connected with the mainland. See the extract.
Italian, from Latin tumulus, mound; see tumulus.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Italian tombolo ("pillow"), from Latin tumulus ("mound"), from tumeō ("I swell"). (Wiktionary)