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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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Extensive chronicity of this disease affects the parodontium and at that point radiographic changes are seen as lighter shades of the periapical bone, as well as widening of the periodontal space or thickening of the lamina dura.
--Dental status--Intraoral (12 features): tooth status, tooth vitality, parodontium condition, hygiene.sub..sub.