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There are 17 twelve-letter words containing E, P, R, T, U and X

AUTOEXPOSUREautoexposure n. (Photography) automatic selection of exposure settings.
AUTOEXPOSURE n. a system for automatically adjusting the aperture and/or shutter speed of a camera according to the lighting conditions.
AUXOTROPHIESauxotrophies n. Plural of auxotrophy.
AUXOTROPHY n. the state of being auxotrophic, requiring a specific growth substance beyond the minimum required for normal metabolism.
EXECUTORSHIPexecutorship n. The office or position of an executor.
EXECUTORSHIP n. the office of executor.
EXPENDITURESexpenditures n. Plural of expenditure.
EXPENDITURE n. the act of expending.
EXPOSTULATORexpostulator n. One who expostulates.
EXPOSTULATOR n. one who expostulates.
EXPURGATIONSexpurgations n. Plural of expurgation.
EXPURGATION n. the act of expurgating.
HETERODUPLEXheteroduplex n. (Biochemistry) A nucleic acid composed of two chains with each derived from a different parent molecule.
heteroduplex v. To form such a compound by genetic recombination.
HETERODUPLEX n. a nucleic-acid molecule, such as DNA, composed of two chains with each derived from a different parent molecule.
HYPERTEXTUALhypertextual adj. Of or relating to hypertext.
MULTIPLEXERSmultiplexers n. Plural of multiplexer.
MULTIPLEXER n. a device enabling a computer to transmit data to many terminals by switching quickly from one user's data to another, also MULTIPLEXOR.
MULTIPLEXORSmultiplexors n. Plural of multiplexor.
MULTIPLEXOR n. a device enabling a computer to transmit data to many terminals by switching quickly from one user's data to another, also MULTIPLEXER.
PNEUMOTHORAXpneumothorax n. (Medicine) Presence of air inside the pleural cavity, usually caused by injury either to the lung or the chest wall.
PNEUMOTHORAX n. accumulation of air or gas in the pleural cavity.
PORTMANTEAUXportmanteaux n. Plural of portmanteau.
PORTMANTEAU n. (French) a case opening in two parts, used for carrying clothes while traveling, also PORTMANTLE, PORTMANTUA.
POSTEXPOSUREpostexposure adj. After exposure (To radiation, pathogens, etc.).
POSTEXPOSURE adj. taking place after exposure.
SUPEREXALTEDsuperexalted v. Simple past tense and past participle of superexalt.
superexalted adj. (Rare) Raised to the highest status or rank; supremely exalted.
SUPEREXALT v. to exalt to a superior degree.
UNDEREXPLOITunderexploit v. To exploit insufficiently.
UNDEREXPLOIT v. to make insufficient use of.
UNEXPURGATEDunexpurgated adj. Not expurgated, not having had anything objectionable removed.
UNEXPURGATED adj. not expurgated.
XIPHISTERNUMxiphisternum n. (Biology, medicine) Synonym of xiphoid process.
XIPHISTERNUM n. the posterior and smallest of the three divisions of the sternum.

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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