wisdom tooth

noun

1. the third molar on each side of the upper and lower jaws: the last tooth to erupt.

wisdom tooth

noun

1. any of the four molar teeth, one at the back of each side of the jaw, that are the last of the permanent teeth to erupt Technical namethird molar
2. cut one's wisdom teeth
   to arrive at the age of discretion

wisdom tooth

/ wĭz′dəm /

1. One of four molars, the last on each side of both jaws in humans, usually appearing in young adulthood.

Word History and Origins

Origin of wisdom tooth¹

First recorded in 1660–70

Idioms and Phrases

Idioms

1. cut one's wisdom teeth, to attain maturity or discretion.