1The finger between the middle finger and little finger; well known as the finger on which wedding rings are worn.
彼はプロポーズのとき、彼女の薬指に指輪をはめた。
When he proposed, he put the ring on her ring finger.
薬指にマニキュアを塗るのが好きだ。
I like putting nail polish on my ring finger.
けがをした人差し指の代わりに、薬指でキーボードを打った。
Since my index finger was injured, I typed using my ring finger instead.
2The fourth toe, counting from the big toe; rarely discussed on its own in everyday conversation.
靴が小さくて、足の薬指が痛くなった。
My shoes were too small, and my fourth toe started to hurt.