glacis (n.)youdaoicibaDictYouDict[glacis 词源字典]
"sloping bank" (especially leading up to a fortification), 1670s, from French glacir "to freeze, make slippery," from Old French glacier "to slip, glide," from Vulgar Latin *glaciare "to make or turn into ice," from Latin glacies "ice" (see glacial).[glacis etymology, glacis origin, 英语词源]