出典:Wiktionary
From Middle English leche fingir, læchefinger, from 古期英語 lǣċefinger (“fourth finger, leech-finger”), equivalent to leech (“physician”) + finger. Compare Old Norse lǽknisfingr (“leech-finger”), Icelandic læknisfingur. According to medieval belief, a nerve or artery ran from this digit to the heart. It gave the finger a prominent role in medical lore and practice. Doctors would use it when applying treatments, for example.[1]
leech-finger (複数形 leech-fingers)