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There are 393 eighteen-letter words containing D, E, I, O, S, T and Y

(page 3)

protodesilylationsprotoplanetary␣discprotoplanetary␣diskpseudoanaphylacticpseudoetymologicalpseudogynecomastiapseudoheritabilitypseudohypertensionpseudohypertrophicpseudohyponatremiapseudoleukocytosispseudometaphysicalpseudomythologicalpseudopolycythemiapseudopsychopathicpseudosynaesthesiapseudouridylationspsychodermatologicpsychopathologizedquasithermodynamicradiation␣chemistryradiosynovectomiesrectosigmoidectomyrectosigmoidoscopyRed␣Queen␣hypothesisreductionisticallyreproductive␣systemresolution␣advisoryreticulated␣pythonsrides␣the␣cotton␣ponyrumination␣syndromesafety-deposit␣boxesSandmeyer␣reactionsscansoriopterygidsscheduled␣territorySchnitzler␣syndromescimitar-horned␣oryxsecondary␣educationsecondary␣infectionsecondary␣intentionsecondary␣liabilitysecondary␣predationsecurity␣proceduressedimentologicallyserodiagnosticallysialoglycopeptidessialylglycopeptideskinny␣drink␣of␣watersleeping␣dictionarysmokestack␣industrysodicanthophyllitesodium␣hypochloritesolitary␣sandpipersSouthwick␣and␣Widleyspondylarthritidesspondylotherapistsstakeholder␣societystandard␣of␣identitystanding␣on␣ceremonystand␣on␣one's␣dignitysticky␣shed␣syndromestrongylocentrotidSt␣Totteringham's␣Daystylohyoid␣ligamentsulfametoxydiazinesulfoglycopeptidessummability␣methodsSunnyside-Tahoe␣Citysuperextraordinarysympathetic␣powderssympathoadrenergicsynthetic␣divisionstakes␣a␣ride␣to␣Tyburntenoepiphysiodesistetrahydrocortisolthalassochelydiansthermodynamic␣statethiophosphorylatedthree-dimensionallytight␣pants␣syndrometime␣and␣motion␣studytoxic␣shock␣syndrometransendotheliallytranshydrogenation trans-hydrogenationtrichlorodiphenylstrihexosylceramidetrihydroxybenzenestrihydroxystilbeneunderglycolysationunderglycosylationValentino's␣syndromevasoepididymostomyvelocity␣dispersionvolcanosedimentarywave␣the␣bloody␣shirtwhite␣carbohydrateswinter-over␣syndromewith␣one's␣eyes␣closedxylosylfructosideszygomaticosphenoid

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 334 words
  • Spanish Wiktionary: 3 words
  • Italian Wiktionary: no word
  • German Wiktionary: 46 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 22 words

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