ring finger

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The third finger of the left hand.

Century Dictionary and Cyclopedia

1. n. The third finger of the left hand, on which the marriage-ring is placed; in anatomy, the third finger of either hand, technically called the annularis.

Wiktionary

1. n. Finger between middle finger and little finger; the "third finger" (UK) or the "fourth finger" (US), especially of the left hand. (The ring finger is the left hand; a ring finger is either hand.)

GNU Webster's 1913

1. n. the third finger of the left hand, or the next the little finger, on which the ring is placed in marriage.

WordNet 3.0

1. n. the third finger (especially of the left hand)