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wisdom tooth

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noun
  1. the third molar on each side of the upper and lower jaws: the last tooth to erupt.
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Idioms
  1. cut one's wisdom teeth, to attain maturity or discretion.
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Origin of wisdom tooth

First recorded in 1660–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for wisdom teeth

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 eruptTechnical name: third molar
  2. cut one's wisdom teeth to arrive at the age of discretion
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

wisdom teeth in Medicine

wisdom tooth

(wĭzdəm)
n.
  1. The third molar tooth on both sides of each jaw that erupts from the 17th to the 23rd year.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

wisdom teeth in Science

wisdom tooth

[wĭzdəm]
  1. One of four molars, the last on each side of both jaws in humans, usually appearing in young adulthood.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

wisdom teeth in Culture

wisdom teeth

Four molars, two on the upper jaw and two on the lower jaw, that are the last teeth to emerge in the mouth.

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Note

These teeth are associated with wisdom because they appear during the late teens or early twenties, when a person is physically mature. Often, the wisdom teeth may not rise above the gum line, but remain impacted in the jaw, causing inflammation. If this impaction occurs, or if they pose a threat to other teeth, the wisdom teeth may need to be removed.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.