Chin
The front of the lower jaw below the lower lip.
Also: mentum
The chin is the forward point of the mandible. Humans are the only living apes with a true bony chin, and why it evolved is still debated. Chins vary in width, length and how far they project, and the shape helps set a face's outline: pointed in heart and diamond faces, broad in square ones. A beard is often shaped to lengthen, widen or round off the chin, and the goatee and Van Dyke are grown on it.