Real Dictionary

finger
A finger of something such as smoke or land is an amount of it that is shaped rather like a finger.
The fingers of a glove are the parts that a person's fingers fit into.
countable noun: Your fingers are the four long thin parts at the end of each hand.
verb: If you finger a person or organization, you tell someone, usually the police, that the person or organization has done something illegal or wrong.
verb: If you finger something, you touch or feel it with your fingers.

finger in American English
intransitive verb: to touch or handle something with the fingers
noun: any of the terminal members of the hand, esp. one other than the thumb
transitive verb: to touch with the fingers; toy or meddle with; handle

finger in British English
noun: any of the digits of the hand, often excluding the thumb

finger in Mechanical Engineering
noun: A finger is a long thin part that sticks out from a machine, especially a part that guides or protects a workpiece.