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There are 7 fifteen-letter words containing E, M, 3R, 2T and U

AUTOTRANSFORMERautotransformer n. (Electrical engineering) A transformer with a single winding, its output being taken from taps.
AUTOTRANSFORMER n. a transformer in which the primary and secondary coils have part or all of their turns in common.
MACROSTRUCTURESmacrostructures n. Plural of macrostructure.
MACROSTRUCTURE n. the structure (as of metal, a body part, or the soil) revealed by visual examination with little or no magnification.
MICROSTRUCTURESmicrostructures n. Plural of microstructure.
MICROSTRUCTURE n. the microscopic structure of a material, as a mineral or a biological cell.
QUARTERMISTRESSquartermistress n. A female quartermaster.
QUARTERMISTRESS n. a female quartermaster.
THERMOREGULATORthermoregulator n. Any organism that carries out thermoregulation.
thermoregulator n. A device that assists with thermoregulation, e.g. for a newborn infant.
THERMOREGULATOR n. a device, such as a thermostat, for the regulation of temperature.
ULTRAMARATHONERultramarathoner n. (Athletics) Someone who participates in ultramarathons.
ULTRAMARATHONER n. one who runs an ultramarathon, a footrace longer than a marathon.
ULTRAMICROMETERultramicrometer n. A very precise micrometer.
ULTRAMICROMETER n. a micrometer for measuring extremely small distances.

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: 42 words
  • Scrabble in French: 11 words
  • Scrabble in Spanish: 4 words
  • Scrabble in Italian: 13 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 33 words


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