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There are 725 eighteen-letter words containing D, I, O, S and Y

(page 4)

macroglycopeptidesmacrohaemodynamicsMadelung's␣deformitymagnesium␣hydroxidemagnetogasdynamicsmagnetohydrostaticMandatory␣PalestineMartin-Bell␣syndromemedium␣spiny␣neuronsmesoeucrocodyliansmesopolysaccharidemethylenediphenolsmethylimidazoliumsmethylprednisolonemethylprotodioscinmicrohaemodynamicsmicrohydrodynamicsmilitary␣abductionsmilk-alkali␣syndromemind␣your␣own␣beeswaxmispolyadenylationmoduli␣of␣elasticitymonoacylglyceridesmonodisciplinaritymonodispersabilitymonohydrochloridesmonohydroperoxidesmonohydroxylationsmother␣and␣baby␣unitsmoved␣the␣yardsticksmoves␣the␣yardsticksmucopolysaccharidemultidimensionallymurder␣your␣darlingsMurphy-Lane␣bone␣skidmy␣kingdom␣for␣a␣horseMymensingh␣Divisionmyocardial␣infarctsmyocardiodystrophynanodosimetricallynanohybridizationsnecessary␣conditionneocynaversicosideneoechinorhynchidsneoglyphioceratidsneurodysregulationneuropsychodynamicnitrobenzaldehydesnitroferricyanidesnitroimidazopyransnitrosalicylic␣acidnonbasidiomycetousnondecomposabilitynonpolysaccharidesnonthienopyridinesnonunderstandinglynostocyclopeptidesnucleopolyhedrosisoctadehydrocorrinsoff␣like␣a␣dirty␣shirtoligodendrocytomasomnidimensionalityonce␣burned,␣twice␣shyordinary␣resolutionoveridealisticallypachycephalosauridpachypleurosauridspachyrhizodontoidspaedopsychologicalpaedopsychologistsPaisley␣UndergroundpalaeobiodiversityPalaeodicotyledonspalaeohydrologistspalaeozygopleuridsparapodiapophysealParkinson's␣syndromeParry␣Sound␣Districtpayload␣specialistspepsinhydrochloricpeptidoglycolipidspeptidylnucleosideperitoneal␣dialysisphenylboronic␣acidsphosphatidylserinephosphoglycolipidsphosphoribosylatedphosphorocyanidatephosphorylceramidephotoendosomolysisphotoendosomolyticphotoendosymbiontsphylobetadiversitypiriformis␣syndromeplastohydroquinoneplaying␣Nostradamusplay␣one's␣cards␣rightplays␣one's␣hand␣rightplay␣with␣edged␣toolsPoland␣Is␣Not␣Yet␣Lostpolybenzimidazolespolydispersibilitypolydispersivitiespolyfunctionalisedpolyhydric␣alcoholspolyphenoloxidasespolyphosphoric␣acidpolyvinylchlorides polyvinyl␣chloridespopulation␣pyramidspostdepositionallypostdiagnosticallypostfoundationallypostpericardiotomypotassium␣hydroxidepredispositionallyPresidency␣divisionprobability␣densitypropagandisticallyprosperity␣doctrineprotocycloceratidsprotodesilylationsprotomicrocotylidsprotoplanetary␣discprotoplanetary␣diskpseudoanaphylacticpseudobiologicallypseudoetymologicalpseudogynecomastiapseudoheritabilitypseudohyperkalemiapseudohypertensionpseudohypertrophicpseudohyponatremiapseudoleukocytosispseudometaphysicalpseudomythologicalpseudoparaphylliumpseudopolycythemiapseudopsychologiespseudopsychopathicpseudosynaesthesiapseudouridylationspseudoxyrhophiinespseudozygopleuridspsychodermatologicpsychodramatically

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 553 words
  • Spanish Wiktionary: 4 words
  • Italian Wiktionary: no word
  • German Wiktionary: 72 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 33 words

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