The thumb is the first digit of the hand. When a person is standing in the medical anatomical position (where the palm is facing to the front), the thumb is the outermost digit. The Medical Latin English noun for thumb is pollex (compare hallux for big toe), and the corresponding adjective for thumb is pollical.

https://en.wikipedia.org/wiki/Thumb

"Better by far to embrace the hard truth than a reassuring fable."
Carl Sagan
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