tombolo (n.)youdaoicibaDictYouDict[tombolo 词源字典]
sand-bar joining an island to the mainland, 1899, from Italian tombolo "sand dune," from Latin tumulus "hillock, mound, heap of earth," from PIE root *teue- (2) "to swell" (see thigh).[tombolo etymology, tombolo origin, 英语词源]