出典:Wiktionary
From Middle English reuþe, ruthe, reuthe, rewthe, reowthe, corresponding to rue + -th, perhaps after early Scandinavian (compare Old Norse hrygð, hryggð (“ruth, sorrow”)).
ruth (countable かつ uncountable, 複数形 ruths)
ruts
burls
wrens
rudds
a wrinkle
ぐぐれ