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There are 793 eighteen-letter words containing A, C, D, H and O

(page 4)

hyperaminoaciduriahyperandrogenaemichyperandrogenicityhypercondensationshypercorticoidemiahypermodificationshypersophisticatedhypidiomorphicallyhypoaminoacidemiashypochondroplasiashypochondroplastichypogalactosylatedhypophosphoric␣acidhyposulphurous␣acidIcelandic␣Sheepdogsicosidodecahedronsideophonographicalimidazoheterocycleindependent␣scholarIndian␣rhinocerosesinheritance␣powdersinsipid␣schizotypalintermediate␣schoolintermitochondrialintramitochondrialisochlorogenic␣acidisolithocholic␣acidisomaltosaccharideisosaccharinic␣acidJordan␣curve␣theoremkinetocardiographsknocked␣at␣the␣door␣ofknocking␣down␣a␣notchknock␣on␣heaven's␣doorlabyrinthectomisedlabyrinthectomizedlactodehydrogenaselamellorthoceratidlead␣chamber␣processLesch-Nyhan␣syndromeleucoanthocyanidinlexicographic␣orderlipopolysaccharidelow-enriched␣uraniumlunch␣pail␣Democratslymphadenectomisedlymphadenectomizedlymphoplasmacytoidlymphoplasmocytoidlypopolysaccharidemacaroni-and-cheesesmacroconidiophoresmacrohaemodynamicsmacropetalichthyidmagnesiochloritoidmagnetohemodynamicmagnetohydrostaticmajor␣seventh␣chordsmannodisaccharidesmarch␣to␣one's␣own␣drumMashonaland␣Centralmathematical␣modelsmechanoadaptationsmechanocardiogramsmechanotransducersmechanotransducingmechanotransducivemechanotransductormedia␣archaeologistmercaptohistidinesmesopolysaccharidemetachondromatosismetaphosphoric␣acidmethanochondroitinméthode␣champenoisemethoxymalonic␣acidmethoxymycolic␣acidMicheldever␣Stationmicrohaemodynamicsmicrohydrodynamicsmicrohydrogenationmicrophyllinic␣acidmicrospathodontinemitochondriopathicmixed-interval␣chordmodular␣arithmeticsmonobronchodilatormountain␣chickadeesmoustached␣warblersmoved␣the␣yardsticksmoves␣the␣yardsticksmucopolysaccharideMünchausen␣syndromemy␣car␣has␣broken␣downmyeloradiculopathymyocardiodystrophynails␣on␣a␣chalkboardnarcodictatorshipsnarrow-width␣effectsnematohydrodynamicneochlorogenic␣acidneoglyphioceratidsneuropsychodynamicnonadecasaccharidenondisenfranchisednonhyperandrogenicnonmonochromatizednonpolysaccharidesnonsadomasochisticNordstrandischmooroccipitosphenoidaloccupational␣hazardoctadehydrocorrinsold␣English␣carriers old␣English␣CarriersOld␣World␣flycatcheroligosaccharidosisopsonophagocytosedorthopediatriciansosteochondroblastsosteochondromatousosteochondropathiaosteochondroplastyother␣backward␣classoverhead␣projectorspachycephalosauridpachychoroidopathypachydermatousnesspachypleurosauridspachyrhizodontoidspacked␣to␣the␣rafterspaedopsychologicalpaedopsychologistspalaeohydrographicpalaeohydrologicalpalaeopropithecidspaleodemographicalpallidosubthalamicparacrocodylomorphpentadodecahedronspentakaidecahedronPeruvian␣Inca␣Orchidpetro-dictatorshipsphacoiridencleisispharmacodependence

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