六ろく歳さい臼きゅう歯し

noun

six-year molar

Dental term for the first permanent molar, which typically erupts around age six.

• 六ろく歳さい臼きゅう歯しは永えい久きゅう歯しの中なかで最もっとも早はやく生はえてくる。

  The six-year molar is the earliest permanent tooth to erupt.