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There are 7 fifteen-letter words containing M, 3O, R, S and 2T

CHEMOAUTOTROPHSchemoautotrophs n. Plural of chemoautotroph.
CHEMOAUTOTROPH n. any organism, e.g. bacteria, that produces energy by the oxidation of inorganic compounds, such as iron, ammonia and hydrogen sulphide, also CHEMOAUTROPH.
CHROMATOLOGISTSCHROMATOLOGIST n. a specialist in chromatology.
DIAPHOTOTROPISMDIAPHOTOTROPISM n. the state of being diaphototropic, turning transversely to the light.
NONIMPORTATIONSnonimportations n. Plural of nonimportation.
NONIMPORTATION n. something that is not importation.
ORTHOCHROMATISMorthochromatism n. Quality of being orthochromatic.
ORTHOCHROMATISM n. the state of being orthochromatic, of photographic film, sensitive to all colours except red.
PROPORTIONMENTSproportionments n. Plural of proportionment.
PROPORTIONMENT n. the act of proportioning.
PYROPHOTOMETERSPYROPHOTOMETER n. a type of pyrometer in which the temperature of an incandescent body is determined by photometric measurement of the light it emits.

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: 125 words
  • Scrabble in French: 7 words
  • Scrabble in Spanish: 14 words
  • Scrabble in Italian: 73 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 44 words


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