ring finger

This term refers specifically to the fourth digit of the hand. In many Western cultures, it is the traditional finger used for wedding and engagement bands due to an ancient, though scientifically unfounded, belief that a vein called the vena amoris ran directly from this finger to the heart.

Because it is a specific anatomical part of a single hand, it is typically used in the singular. While it is a countable noun, it is rarely pluralized unless referring to the ring fingers of both hands simultaneously.