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There are 15 fifteen-letter words containing I, O, P, 3R, S and T

ARTERIOGRAPHIESarteriographies n. Plural of arteriography.
ARTERIOGRAPHY n. the radiographic visualization of an artery after injection of a radiopaque substance.
FERROPRUSSIATESferroprussiates n. Plural of ferroprussiate.
FERROPRUSSIATE n. ferrocyanide.
HISTORIOGRAPHERhistoriographer n. A scholar who studies historiography.
HISTORIOGRAPHER n. one who practises historiography, the study of writing history.
IRRECIPROCITIESIRRECIPROCITY n. lack of reciprocity.
MICROENTERPRISEmicroenterprise n. (Business) A very small business with five or fewer employees, or the business sector comprising these businesses.
MICROPROJECTORSmicroprojectors n. Plural of microprojector.
MICROPROJECTOR n. a projector utilizing a compound microscope for projecting on a screen a greatly enlarged image of a microscopic object.
MICROPYROMETERSMICROPYROMETER n. a pyrometer for measuring the temperature of very small objects.
OVERPROPORTIONSoverproportions v. Third-person singular simple present indicative form of overproportion.
OVERPROPORTION v. to make disproportionately large.
PETROCURRENCIESpetrocurrencies n. Plural of petrocurrency.
PETROCURRENCY n. currency, etc., acquired by the oil-producing countries as profit from the sale of their oil to the consumer countries.
PREREGISTRATIONpreregistration n. An early registration, before the normal or traditional time, as with early online check-in at hotels.
preregistration n. Registration (of a study design) before a clinical trial (or any other type of scientific experiment)…
preregistration adj. Before registration.
PROCRASTINATORSprocrastinators n. Plural of procrastinator.
PROCRASTINATOR n. one who procrastinates.
PROCRASTINATORYprocrastinatory adj. Of or pertaining to procrastination.
PROCRASTINATORY adj. tending to procrastinate, also PROCRASTINATIVE.
PROCURATORSHIPSprocuratorships n. Plural of procuratorship.
PROCURATORSHIP n. the office of procurator.
PROPRIETORSHIPSproprietorships n. Plural of proprietorship.
PROPRIETORSHIP n. the office of proprietor.
PROTOPORPHYRINSprotoporphyrins n. Plural of protoporphyrin.
PROTOPORPHYRIN n. metal-free porphyrin derived from blood hemin.

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: 171 words
  • Scrabble in French: 82 words
  • Scrabble in Spanish: 56 words
  • Scrabble in Italian: 151 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 171 words


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