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(ˌpɛr i əˈdɒn ʃəm, -ʃi əm)

n., pl. -tia (-ʃə, -ʃi ə)
the bone, connective tissue, and gum surrounding and supporting a tooth.
[1955–60; peri- + -odont + -ium2]
References in periodicals archive ?
Upper first molar-centered buccal-lingual tissue slices were generated from the upper first molars and peridentium of the remaining eight rats from each group.