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List of 15-letter words containing

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There are 16 fifteen-letter words containing E, M, O, 3R 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.
CIRCUMFERENTORScircumferentors n. Plural of circumferentor.
CIRCUMFERENTOR n. a surveyor's angle-measuring compass instrument.
COUNTERREFORMEDCOUNTERREFORM v. to make a reform designed to counter another reform.
COUNTERREFORMERcounterreformer n. One who supports counterreform and is therefore opposed to reform.
counterreformer n. (Historical, Roman Catholicism) Alternative spelling of Counter-Reformer (“proponent of the Counter-Reformation”).
Counter-Reformer n. (Roman Catholicism, historical) A proponent of the Counter-Reformation.
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.
MARGARITIFEROUSmargaritiferous adj. Producing pearls.
MARGARITIFEROUS adj. pearl-bearing.
MICROMICROCURIEMICROMICROCURIE n. the trillionth part of a curie.
MICROSTRUCTURESmicrostructures n. Plural of microstructure.
MICROSTRUCTURE n. the microscopic structure of a material, as a mineral or a biological cell.
ORGANOMERCURIALorganomercurial adj. Describing any organic compound of mercury.
organomercurial n. (Organic chemistry) Any organic compound of mercury, but especially such a drug.
ORGANOMERCURIAL n. an organic compound or a pharmaceutical preparation containing mercury.
RESURRECTIONISMresurrectionism n. Belief in, or the event of, a person being resurrected from the dead.
resurrectionism n. (Historical) Graverobbing.
RESURRECTIONISM n. belief in the Resurrection.
RUMORMONGERINGSRUMORMONGERING n. the spreading of rumours.
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.
UNDERPERFORMERSunderperformers n. Plural of underperformer.
UNDERPERFORMINGunderperforming v. Present participle of underperform.
underperforming adj. That performs less well than required.
UNDERPERFORM v. to perform insufficiently.

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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