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There are 695 eighteen-letter words containing 2I, 3O and S

(page 3)

isoelectrophoresisisoelectrophoreticisolithocholic␣acidisonitroso␣compoundjockeys␣for␣positionkeratoelastoidosisknocking␣down␣to␣sizeknow␣what␣o'clock␣it␣isknow␣what␣one␣is␣doinglepidopterologistsLeri's␣pleonosteosislipogranulomatosislymphohistocytosismacroconidiophoresmacroevolutionistsmacroinvertivorousmacrophysiologicalmagnesiochloritoidmagnesiocoulsonitemagnetoassociationmagnetooscillationmemorandum␣opinionsmesoionic␣compoundsmetabololipidomicsmethylprotodioscinmetropolitan␣bishopmicrobiogeologistsmicroclimatologistmicroconsolidationmicrocontributionsmicrocosmographiesmicrodecompressionmicroembolizationsmicroevolutionistsmicrofractionatorsmicroglycoproteinsmicroiontophoresismicrolaryngoscopicmicrolepidopterousmicrometeorologistmicromorphometricsmicroneighborhoodsmicroneurotrophinsmicro-optimizationsmicropatriologistsmicrophysiologicalmicroreproductionsmicroseismologicalmicrospathodontinemicrospectroscopicmicrostromatolitesmicrotechnologistsmicrothalamotomiesmicrowhip␣scorpionsmineralocorticoidsmisprognosticationmissionary␣positionMissouri␣Fox␣TrotterMissouri␣gooseberryMissouri␣toothpicksmitochondriotoxinsmolecular␣biologistmonoesterificationmonofunctionalisedmonointercalationsmonoisopropylaminemonophthongisationmonosaponificationmonostratificationmonotonic␣functionsmorphohistologicalmultimethodologiesmycobacteriologistmyoepitheliomatousnanobiodiagnosticsnanobioelectronicsnanoconfigurationsnano-decompositionsneuroimmunologistsneuroleptospirosisneurophilosophicalneurophysiologicalneurophysiologistsneurotoxicologistsneutrophilopoiesisnitrosodisulfonatenitrosoglutathionenitrosylmyoglobinsnitrotyrosinationsnomination␣boroughsnonaggression␣axiom non-aggression␣axiomnonbasidiomycetousnoncompositionallynoncooperationistsnoncorticosteroidsnondecomposabilitynonepistemologicalnonfoundationalismnonfoundationalistnonglucocorticoidsnonhistoriographicnonparasitologicalnonpersonificationnonphilosophicallynonphysiologicallynonprofessionalismnonpsychotomimeticnonrevolutionariesnonsadomasochisticnonsociolinguisticnontitanosauriformnontrivial␣solutionnormative␣economicsnormophysiologicalno␣smoke␣without␣firenucleoriboproteinsoblique␣correctionsoblique␣projectionsoccipitosphenoidaloesophagostomiasisŌkuninushi-no-mikotooligocellodextrinsoligochaetologistsoligodendrogenesisoligodendrogliomasoligodendrogliosisoligodendropathiesoligoendopeptidaseoligonucleotidasesoligoribonucleasesoligosaccharidosisoligoteratospermiaolive-backed␣orioleson␣a␣collision␣courseontoepistemologieson␣trial␣for␣one's␣lifeoperationalisationopisthomonorchiineopposition␣researchOppression␣Olympicsoptical␣microscopesOrder␣of␣Friars␣Minorordinary␣resolutionorganoboronic␣acidsornithomimosaurianorthogonalisationsorthogonalizationsorthonormalisation

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