Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: peri- (from Greek; PERICARDIUM) + Greek odous 'tooth'

periodontal

 adjective
     
per‧i‧o‧don‧tal technical
relating to the part of the mouth at the base of the teeth:
periodontal disease
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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