littoral (adj.)youdaoicibaDictYouDict[littoral 词源字典]
"pertaining to the seashore," 1650s, from Latin littoralis "of or belonging to the seashore," from litus (genitive litoris) "seashore" (compare Lido), of unknown origin, possibly from PIE root *lei- "to flow." The noun is first recorded 1828, from Italian littorale, originally an adjective, from Latin littoralis.[littoral etymology, littoral origin, 英语词源]