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There are 5 fifteen-letter words containing ERIOD

PERIODONTICALLYPERIODONTIC adv. relating to periodontia, the branch of dentistry concerned with periodontal diseases.
PERIODONTITIDESperiodontitides n. Plural of periodontitis.
PERIODONTITISESPERIODONTITIS n. inflammation of the tissues surrounding the teeth.
PHOTOPERIODISMSphotoperiodisms n. Plural of photoperiodism.
PHOTOPERIODISM n. a plant or animal's response or capacity to respond to photoperiod.
THERMOPERIODISMthermoperiodism n. The property of being thermoperiodic.
THERMOPERIODISM n. the effect on an organism of rhythmic temperature variations.

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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