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There are 9 twelve-letter words containing PERIOD

ANTIPERIODICantiperiodic adj. (Medicine) preventing the regular recurrence of symptoms.
antiperiodic adj. (Mathematics) Exhibiting antiperiodicity.
antiperiodic n. (Medicine) A drug that prevents the regular recurrence of symptoms.
APERIODICITYaperiodicity n. The condition of being aperiodic.
APERIODICITY n. the state of being aperiodic.
METAPERIODICMETAPERIODIC adj. as in metaperiodic acid.
PARAPERIODICPARAPERIODIC adj. as in paraperiodic acid.
PERIODICALLYperiodically adv. In a manner that is regular or periodic.
periodically adv. Intermittently or recurrently.
PERIODICAL adv. periodic.
PERIODONTIASPERIODONTIA n. the branch of dentistry concerned with periodontal diseases.
PERIODONTICSperiodontics 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.
PERIODONTISTperiodontist n. A dentist whose speciality is periodontics.
PERIODONTIST n. a dentist specialising in periodontics.
PHOTOPERIODSphotoperiods n. Plural of photoperiod.
PHOTOPERIOD n. the period during every 24 hours when an organism is exposed to daylight.

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 WikWik.org and 1Word.ws.

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