Dictionary
trig'ger fin"ger
1. any finger, usually the forefinger, that presses the trigger of a gun.
2. either forefinger, depending on which hand is dominant.
3. Pathol.difficulty in straightening or bending a ring finger, caused by inflammation and thickening of its tendon.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.