Jisho

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Noun
1. wisdom tooth
Noun
2. not knowing who one's birth parents are; person who does not know their birth parents
Wikipedia definition
3. Wisdom toothA wisdom tooth, in humans, is any of the usual four third molars. Wisdom teeth usually appear between the ages of 12 and 25. Most adults have four wisdom teeth, but it is possible to have fewer, or more, in which case they are called supernumerary teeth. Wisdom teeth commonly affect other teeth as they develop, becoming impacted or "coming in sideways. " They are often extracted when this occurs. About 35% of the population do not develop wisdom teeth at all.
Read “Wisdom tooth” on English Wikipedia
Read “親知らず” on Japanese Wikipedia
Read “Wisdom tooth” on DBpedia
Other forms
親不知 【おやしらず】

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