the finger next to the little finger, especially of the left hand, on which an engagement ring or wedding band is traditionally worn.
the third finger, esp of the left hand, on which a wedding ring is traditionally worn
Collins English Dictionary - Complete & Unabridged 10th Edition
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The third finger of the left hand.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.