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There are 6 twelve-letter words beginning with PERIO

PERIODICALLY	• periodically adv. In a manner that is regular or periodic. • periodically adv. Intermittently or recurrently. • PERIODICAL adv. periodic.
PERIODONTIAS	• PERIODONTIA n. the branch of dentistry concerned with periodontal diseases.
PERIODONTICS	• periodontics n. (Dentistry) The study of supporting structures of teeth—gums, alveolar bone, cementum, and the periodontal… • PERIODONTICS n. the study of gums, as a branch of dentistry.
PERIODONTIST	• periodontist n. A dentist whose speciality is periodontics. • PERIODONTIST n. a dentist specialising in periodontics.
PERIONYCHIUM	• PERIONYCHIUM n. tissue surrounding a nail.
PERIOSTRACUM	• periostracum n. (Malacology) The proteinaceous outer sheath of many molluscan shells. • PERIOSTRACUM n. the horny outer layer of a mollusc's shell.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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English Wiktionary: 22 words
Scrabble in French: 3 words
Scrabble in Spanish: 20 words
Scrabble in Italian: 32 words
Scrabble in German: no word
Scrabble in Romanian: 28 words

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