friable (adj.)youdaoicibaDictYouDict[friable 词源字典]
1560s, from Middle French friable (16c.) and directly from Latin friabilis "easily crumbled or broken," from friare "rub away, crumble into small pieces," related to fricare "to rub" (see friction). Related: Friability.[friable etymology, friable origin, 英语词源]