"surrounding a tooth, pertaining to the lining membrane of the socket of a tooth," 1848, literally "around the tooth," from peri- "around" + Greek odon (genitive odontos) "tooth" (from PIE root *dent- "tooth").
periodontal disease
perineum
period
periodic
periodical
periodicity
periodontal
periodontics
periodontist
periodontitis
periodontium
periorbital
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