pelagic (adj.)youdaoicibaDictYouDict[pelagic 词源字典]
"pertaining to the sea," 1650s, from Latin pelagicus, from Greek pelagikos, from pelagos "sea, high sea, open sea, main," from PIE *pelag- "to spread out" (source of Greek plagos "side," Latin plaga "hunting net, curtain, region"), possibly from root *plak- (1) "to spread out, be flat" (see placenta).[pelagic etymology, pelagic origin, 英语词源]