Nubbin

Nubbin: This 19th century nubbin referred to a stunted ear of corn and any other small/stunted growth. In the 20th century a nubbin was the little mouse controller in the middle of the IBM ThinkPad keyboard. Now in the 21st century nubbin refers to a third nipple or part of the female anatomy.

Langdon looked at his finger, but the only transformation he could see was that he now had an indentation on his skin my by the circular nubbin - a tiny circle with a dot in the middle.

A Word for Today: The Lost Symbol by Dan Brown