Mucous membrane and periosteum so intimately united as to form practically a single membrane, as that covering the hard palate.
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mu·co·peri·os·te·um -'äs-tē-əm n a periosteum backed with mucous membrane (as that of the palatine surface of the mouth)
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mu·co·peri·os·te·um (mu″ko-per″e-osґte-əm) periosteum having a mucous surface, as in parts of the auditory apparatus.Medical dictionary. 2011.