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There are 17 fifteen-letter words containing 2A, H, 2R, T and U

ARCHAEBACTERIUMarchaebacterium n. Any primitive bacteria-like organism in the kingdom Archaea.
archæbacterium n. (Rare) Alternative spelling of archaebacterium.
ARCHAEBACTERIUM n. any of the microorganisms comprising the archaea.
ARCHITECTURALLYarchitecturally adv. In an architectural manner.
architecturally adv. Regarding architecture.
ARCHITECTURAL adv. of or relating to architecture.
AUTOBIOGRAPHERSautobiographers n. Plural of autobiographer.
AUTOBIOGRAPHER n. one who writes autobiographies.
AUTORADIOGRAPHSautoradiographs n. Plural of autoradiograph.
AUTORADIOGRAPH n. an autoradiographic record, also RADIOAUTOGRAPH.
AUTORADIOGRAPHYautoradiography n. The process of making autoradiographs.
AUTORADIOGRAPHY n. a technique used to show the distribution of radioactively labelled molecules in cells or tissues.
MICROEARTHQUAKEmicroearthquake n. A very low-intensity earthquake, usually three or less on the Richter scale.
MICROEARTHQUAKE n. an earthquake of low intensity.
MULTICHARACTERSSorry, definition not available.
PARTHENOCARPOUSparthenocarpous adj. Alternative form of parthenocarpic.
PARTHENOCARPOUS adj. relating to parthenocarpy.
PROTOSPATHARIUSprotospatharius n. Alternative form of protospatharios.
PROTOSPATHARIUS n. (historical) the captain of the guards at Byzantium, also PROTOSPATAIRE, PROTOSPATHAIRE.
RADIOAUTOGRAPHSradioautographs n. Plural of radioautograph.
RADIOAUTOGRAPH n. an autoradiographic record, also AUTORADIOGRAPH.
RADIOAUTOGRAPHYradioautography n. Autoradiography.
RADIOAUTOGRAPHY n. the use of radioautographs.
REAUTHORISATIONreauthorisation n. Alternative form of reauthorization.
REAUTHORISATION n. the process of reauthorising, also REAUTHORIZATION.
REAUTHORIZATIONreauthorization n. A second or subsequent authorization.
reauthorization n. A renewal of an authorization.
REAUTHORIZATION n. the process of reauthorizing, also REAUTHORISATION.
TETRAHYDROFURANtetrahydrofuran n. (Organic chemistry) A heterocyclic ether having a five-membered ring with four carbon atoms and one…
TETRAHYDROFURAN n. a flammable liquid ether derived from furan and used as a solvent and as an intermediate in organic synthesis.
THIOBARBITURATEthiobarbiturate n. (Medicine) Any compound obtained from a barbiturate by the formal substitution of an oxygen atom by one of sulfur.
THIOBARBITURATE n. a salt of thiobarbituric acid similar in effect to a barbiturate.
ULTRAMARATHONERultramarathoner n. (Athletics) Someone who participates in ultramarathons.
ULTRAMARATHONER n. one who runs an ultramarathon, a footrace longer than a marathon.
ULTRASONOGRAPHYultrasonography n. (Medicine) The use of ultrasound to produce diagnostic images of the internal organs of the body, or of a foetus.
ultrasonography n. The use of ultrasound to form images of underwater structures.
ULTRASONOGRAPHY n. the use of ultrasound.

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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