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There are 988 eighteen-letter words containing 2I, O, R and Y

(page 5)

magnetic␣anisotropymagnetoelectricitymagnetoreceptivitymagnetoresistivitymagnetostrictivelymandibulomaxillarymaritime␣archeologymaternity␣hospitalsmechanoreciprocitymedium␣spiny␣neuronsmemory␣institutionsmetapolycentricitymeteorosensitivitymethylprotodioscinmicrocrystallinitymicroglycoproteinsmicrohaemodynamicsmicroheterogeneitymicrohydrodynamicsmicrohydrogenationmicrolaryngoscopicmicrolissencephalymicrophyllinic␣acidmicrophysiologicalmicroreversibilitymicrosyntacticallymilitary␣abductionsmilitary␣governmentmilk-alkali␣syndromeminority␣governmentmissionary-linguist missionary␣linguistmissionary␣positionMissouri␣gooseberrymissynchronizationmonodisciplinaritymonodispersabilitymonoisopropylaminemorphosyntacticianMüller-Lyer␣illusionmultidirectionallymycobacteriologistmycobacteriostasismycobacteriostaticmyeloarchitectonicmyeloproliferatingmyeloproliferationmyeloproliferativemyocardial␣infarctsmyodifferentiationmyofibrillogenesisnanodosimetricallynanohybridizationsnecessary␣conditionneocynaversicosideneoechinorhynchidsneoglyphioceratidsneoichthyosauriansneurocysticercosisneurocysticercoticneuropathogenicityneurophysiologicalneurophysiologistsneuropsychiatristsneurovulnerabilityNineteen␣Eighty-Fournitrobenzhydrazidenitroferricyanidesnitroheterocyclicsnitroimidazopyransnitrosalicylic␣acidnitrosylmyoglobinsnitrotyrosinationsnobiliary␣particlesnoncholinergicallynoncompressibilitynoncontractibilitynoncontradictorilynondihydropyridinenonidentity␣problemnoninsurrectionarynonintrospectivelynonlogarithmicallynon-military␣servicenonproportionalitynonreproducibilitynonsuppressibilitynonthienopyridinesnontransferabilitynormophysiologicalnot␣in␣a␣million␣yearsnylon-string␣guitarsoff␣like␣a␣dirty␣shirtOlympic␣Winter␣GamesomnidirectionalityOppression␣Olympicsordinary␣resolutionorthopsychiatristsoscillographicallyotomicroscopicallyoveridealisticallyoveroptimisticallyoverpsychologizingoversentimentalityoversimplisticallyoversusceptibilitypachyrhizodontoidspalaeobiochemistrypalaeobiodiversitypalaeomicrobiologypalaeoproductivitypalmitoylcarnitinepancreaticobiliarypanhypopituitarismpanhypoproteinemiapanhypoproteinemicpapilioerythrinoneParry␣Sound␣Districtparsimony␣principlepatristic␣anthologypentaformylgitoxinpepsinhydrochloricpericonceptionallypericyclic␣reactionperiodic␣inequalityperitoneal␣dialysispharyngealizationspharyngoepiglotticpharyngointestinalpharyngolaryngitispharyngotonsilitisphenylboronic␣acidsphenylcarbodiimidephiloprogenitivelyphilosophers␣by␣firephloroglucinolysisphosphatidylserinephotoallergenicityphotodegradabilityphotoreversibilityphycoerythrobilinsphylobetadiversityphylostratigraphicphysiobiochemistryphysiogeographicalpicocyanobacterialpicocyanobacteriumpiezopsychrophilicpink␣fairy␣armadillopiperonylonitrilespiriformis␣syndrome

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 749 words
  • Spanish Wiktionary: 4 words
  • Italian Wiktionary: no word
  • German Wiktionary: 51 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 22 words

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