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periodontium

[per-ee-uh-don-shuh m, -shee-uh m] /ˌpɛr i əˈdɒn ʃəm, -ʃi əm/
noun, plural periodontia
[per-ee-uh-don-shuh, -shee-uh] /ˌpɛr i əˈdɒn ʃə, -ʃi ə/ (Show IPA)
1.
the bone, connective tissue, and gum surrounding and supporting a tooth.
Also, parodontium.
Origin
1955-1960
1955-60; < Neo-Latin; see peri-, -odont, -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for periodontium
n.

1828; see periodontal.

Online Etymology Dictionary, © 2010 Douglas Harper
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periodontium in Medicine

periodontium per·i·o·don·ti·um (pěr'ē-ə-dŏn'shē-əm)
n. pl. per·i·o·don·ti·a (-shē-ə, -shə)
The tissues that surround and support the teeth, including the gums, cementum, periodontal ligament, and alveolar and supporting bone. Also called alveolodental membrane, peridental membrane.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for periodontium

periodontal ligament

fleshy tissue between tooth and tooth socket that holds the tooth in place, attaches it to the adjacent teeth, and enables it to resist the stresses of chewing. It develops from the follicular sac that surrounds the embryonic tooth during growth.

Learn more about periodontal ligament with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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