underbite

noun

un·​der·​bite ˈən-dər-ˌbīt 

plural underbites

: malocclusion in which the lower jaw and front teeth project beyond the upper front teeth : prognathism involving the lower jaw

Three years ago, Jack, a small Chihuahua mix with an endearing underbite and a lust for attention, was dropped off at the Haven Animal Care Shelter.

—Natalie Gross

… had braces to straighten his own teeth and surgery to correct a severe underbite, ….

—Jean P. Fisher

compare overbite

Word History

First Known Use

1887, in the meaning defined above

Medical Definition

underbite

noun

un·​der·​bite ˈən-dər-ˌbīt 

: malocclusion in which the lower jaw and front teeth project beyond the upper front teeth : prognathism involving the lower jaw

… had braces to straighten his own teeth and surgery to correct a severe underbite, as well as whitening.

—Jean P. Fisher

compare overbite