牙周膜
/ˈpiəɹɪədˌɒntəl ˈlɪɡəmənt/
n
English: periodontal ligament · 牙周膜
English · periodontal ligamentEspañol · ligamento alveolo-dentarioFrançais · ligament alvéolo-dentaire
释义：Fibrous connective tissue joining the cementum to the bone, thus fixing the tooth into its alveolus.