Thumb - Wikipedia - Finger and thumb
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A thumb is a digit, but not technically a finger. Let’s look into whether or not you can accurately call your thumb a finger. Thumb refers to the first digit of the human hand, set apart and opposable to the other four digits of the hand. The klgd.info definition for finger is as follows: 'each of the four slender jointed parts attached to either hand (or five, if the thumb is included)'.