/ Dictionary / Index P periodontal membrane: Meaning and Definition of Find definitions for: per'iodon'tal mem'brane Pronunciation: [key] — Dentistry. Dentistry. the collagenous, fibrous connective tissue between the cementum of the tooth and the alveolus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. periodontal disease periodontics Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language