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There are 5 twelve-letter words containing G, I, L, 4O and T

GNOTOBIOLOGYgnotobiology n. (Biology) The study of animals in a microbe-free environment.
GNOTOBIOLOGY n. the study of life in germfree conditions.
HOMOLOGATIONhomologation n. (Organic chemistry) Any reaction that converts a compound into the next member of a homologous series…
homologation n. (Law) Official certification.
HOMOLOGATION n. confirmation, agreement.
ODONTOLOGIESODONTOLOGY n. the study of teeth.
ODONTOLOGISTodontologist n. One who studies teeth.
ODONTOLOGIST n. a student of odontology.
PHOTOBIOLOGYphotobiology n. The study of the effects of light on living organisms, and on biological processes.
PHOTOBIOLOGY n. the study of the effects of light on organisms.

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: 15 words
  • Scrabble in French: 2 words
  • Scrabble in Spanish: 15 words
  • Scrabble in Italian: 25 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 26 words


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