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There are 20 thirteen-letter words containing A, C, M, O, P, R, T and U

AMPHITRICHOUSamphitrichous adj. (Biology) (of bacteria) Having a single flagellum on each of two opposite ends. (Only one flagellum…
AMPHITRICHOUS adj. of or like amphitricha, bacteria that have flagella at both ends.
CHEMAUTOTROPHCHEMAUTOTROPH n. an organism, such as a bacterium, that obtains its energy from inorganic reactions using simple compounds, such as ammonia or carbon dioxide.
CHEMOAUTROPHSCHEMOAUTROPH n. any organism, e.g. bacteria, that produces energy by the oxidation of inorganic compounds, such as iron, ammonia and hydrogen sulphide, also CHEMOAUTOTROPH.
COMPURGATIONScompurgations n. Plural of compurgation.
COMPURGATION n. the exoneration of an accused person on the basis of oaths sworn by other persons.
IMPORTUNACIESimportunacies n. Plural of importunacy.
IMPORTUNACY n. the state of being importunate.
METACOMPUTERSMETACOMPUTER n. a collection of computers that looks and functions like a single computer.
MULTIPLICATORmultiplicator n. (Mathematics) Synonym of multiplier.
multiplicator n. (Mathematics) Schur multiplier.
MULTIPLICATOR n. a multiplier.
MUSICOTHERAPYmusicotherapy n. Music therapy; the use of music to improve health.
MUSICOTHERAPY n. therapy involving the use of music.
PARAMOUNTCIESparamountcies n. Plural of paramountcy.
PARAMOUNTCY n. the state of being paramount, also PARAMOUNCY.
PERIOSTRACUMSPERIOSTRACUM n. the horny outer layer of a mollusc's shell.
PNEUMOGASTRICpneumogastric adj. (Anatomy) Of or pertaining to the lungs and the stomach.
pneumogastric adj. (Anatomy) vagus (attributive).
pneumogastric n. (Anatomy) The pneumogastric nerve; one of the tenth pair of cranial nerves which are distributed to…
POCOCURANTISMpococurantism n. Indifference, nonchalance.
POCOCURANTISM n. indifference, also POCOCURANTEISM.
POSTTRAUMATICposttraumatic adj. After, or as a result of, a trauma.
post-traumatic adj. Alternative spelling of posttraumatic.
POSTTRAUMATIC adj. taking place after trauma.
PROTACTINIUMSPROTACTINIUM n. a radioactive metallic chemical element, a member of the actinide series which occurs as a decay product in uranium ores.
PROTOACTINIUMprotoactinium n. Dated form of protactinium.
PROTOACTINIUM n. a radioactive element that yields actinium on disintegration.
RECOMPUTATIONrecomputation n. The act, process or result of recomputing; recalculation.
RECOMPUTATION n. the act of recomputing.
SOMATOPLEURICsomatopleuric adj. (Embryology) Pertaining to the somatopleure; somatopleural.
SOMATOPLEURIC adj. of or like a somatopleure, also SOMATOPLEURAL.
SUPERROMANTICsuperromantic adj. Exceptionally romantic.
SUPERROMANTIC adj. extremely romantic.
UNIMPORTANCESUNIMPORTANCE n. lack of importance.
UNPROBLEMATICunproblematic adj. Not problematic (presenting problems) or not controversial.
UNPROBLEMATIC adj. not problematic.

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: 80 words
  • Scrabble in French: 26 words
  • Scrabble in Spanish: 58 words
  • Scrabble in Italian: 42 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 103 words


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