skein (n.)youdaoicibaDictYouDict[skein 词源字典]
"fixed quantity of yarn doubled over and over and knotted, mid-15c., from Middle French escaigne "a hank of yarn" (Old French escagne, mid-14c., Modern French écagne), of uncertain origin. Compare Medieval Latin scagna "a skein," Irish sgainne "a skein, clue."[skein etymology, skein origin, 英语词源]