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There are 4 fourteen-letter words containing OPERI

ISOPERIMETRIESISOPERIMETRY n. the state of being isoperimetrical.
PHOTOPERIODISMphotoperiodism n. (Biology) The growth, development and other responses of plants and animals according to the length…
PHOTOPERIODISM n. a plant or animal's response or capacity to respond to photoperiod.
PROPERISPOMENAproperispomena n. Plural of properispomenon.
PROPERISPOMENON n. a word with the circumflex accent on the penultimate syllable.
THERMOPERIODICthermoperiodic adj. Relating to a thermoperiod.
THERMOPERIODIC adj. relating to thermoperiodism, 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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See this list for:

  • English Wiktionary: 23 words
  • Scrabble in French: 3 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: 10 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 30 words


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