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mucoperiosteum

[ myōō′kō-pĕr′ē-ŏstē-əm ]
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n.
Mucous membrane and periosteum so intimately united as to form nearly a single membrane.
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Which of the following nouns has an irregular plural form?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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