periodontium
noun
peri·odon·tium
ˌper-ē-ō-ˈdän-ch(ē-)əm
plural periodontia
-ch(ē-)ə
: the supporting structures of the teeth including the cementum, the periodontal ligament, the bone of the alveolar process, and the gums
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Merriam-Webster unabridged
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