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There are 6 fifteen-letter words containing OPERI

ISOPERIMETRICALisoperimetrical adj. Isoperimetric.
ISOPERIMETRICAL adj. having equal perimeters.
NINCOMPOOPERIESnincompooperies n. Plural of nincompoopery.
NINCOMPOOPERY n. the state of being a nincompoop.
PHOTOPERIODISMSphotoperiodisms n. Plural of photoperiodism.
PHOTOPERIODISM n. a plant or animal's response or capacity to respond to photoperiod.
PROPERISPOMENONproperispomenon adj. (Linguistics, of a word) In Greek grammar, having a circumflex accent on the penultimate syllable.
properispomenon n. (Linguistics) A word having such an accent.
PROPERISPOMENON n. a word with the circumflex accent on the penultimate syllable.
RETROPERITONEALretroperitoneal adj. Located behind the peritoneum.
RETROPERITONEAL adj. situated behind the peritoneum.
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 WikWik.org and 1Word.ws.

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See this list for:

  • English Wiktionary: 39 words
  • Scrabble in French: 5 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: 6 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 15 words


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