#molar__grinder  grinding tooth with a broad crown; located behind the premolars
  supertype:  #tooth  hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense
  subtype:  #wisdom_tooth  any of the last 4 teeth on each side of the upper and lower jaw; the last of the permanent teeth to erupt (between ages 16 and 21)

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