ring finger; fourth finger
The finger between the middle finger and little finger. In piano playing, it is often called the fourth finger.
A beautiful ring sparkled on her ring finger.
ピアノを弾くとき、薬指は他の指より動かしにくい。
When playing the piano, the fourth finger is harder to move than the other fingers.
fourth toe
The toe next to the little toe. Less common than the finger sense; usually clear from context.
足の薬指に小さな靴擦れができた。
I got a small blister on my fourth toe.
She wears a ring on her ring finger.
I fell and broke my ring finger.