tain (n.)youdaoicibaDictYouDict[tain 词源字典]
"thin tin plate for mirrors, etc.," 1858, from French tain "tinfoil" (17c.), an alteration of étain "tin," from Latin stagnum, stannum "alloy of silver and lead," in Late Latin "tin" (see stannic).[tain etymology, tain origin, 英语词源]