also: がくこつ · あごぼね
Anatomical term for the bone of the jaw; can refer to either the upper or lower jawbone, though often used for the mandible.
I fractured my jawbone in the accident.
Let's take an X-ray of your jawbone.
Standard kanji spelling; the reading がっこつ is the most common pronunciation.
Alternate reading; less common than がっこつ.
Mixed kanji-kana spelling using the kun'yomi reading あごぼね; more colloquial.
Kana spelling for the kun'yomi reading; common in everyday writing.
Compound of 顎 (gaku, 'jaw') and 骨 (kotsu, 'bone'), with the reading がっこつ resulting from a common sound change (sokuonbin).