Longest words in the English language

Supercalifragilisticexpialidocious(34 letters) - wonderful

Hepaticocholangiocholecystentersotomies(39 letters) - Gall Bladder Surgery

Pneumonoultramicroscopicsilicovolcanoconiosis(45 letters) - a lung disease

Ornicopytheobiblopsychocrystarroscioaerogenethliometeoroaustrohieroanthropoi- cichthyopyrosiderochpnomyoalectryoophiobotanopegohydrorhabdocrithoaleuroalphi-tohalomolybdoclerobeloaxinocoscinodactyliogeolithopessopscphocatoptrotephraoeir-ochiroomychodactyloarithstichooxogeloscogastrogyrocerobletonooenoscapulinaniac(310 letters) -a deluded human who practices divination or forecasting

Acetylseryltyrosylserylisoleucylthreonylserylprolylserylglutaminylphenylalanylvalyl-phenylalnelleucylserylserylvalyotriptophylalanylaspartylprolylisoleucylglutamylleucyl-lencyllasparaginylvalylcysteinythreonylserylserylleucylglycllasparatinylglutaminylphe-nylalanylglutaminylthreonylglutaminylglutaninylalanylarginylthrseonylthreonylglutam-inylvalylglutaminyglutaninylphenylalanylserylghlutaminylvalyltryptophyllysylrolylphen-ylalaylprolyglutaminylserylthreonylvalylarginylphunylalanylprolylglycylaspartylvalylty-rosyllsvslvalyltyrosylargiyltyosvlasparaginylalanylvalylleusylaspartylprolylleucylisole-ucylthreonylalnylleucylleucylglycyltreonylphnylalanylaspartylthreonylarginlasparagin-ylarginylisoleucylislleucylglutammylvalylglutamylasparaginylglutaminylglutaminylsury-lprolylthreonylthreonylalanyoglutamylthreonylleucylaspartylalanylthreonylarginylargi-nylvalylaspartylaspartylalanylthreonylvalylalanylisoleucylarginylserylalanylasparagin-ylisoleucylasparaginylleucylvallasparaginylglutamylleucylvalylarginylglycylthreonylgl-ycylleucyltyrosylasparaginylglutaminylasparaginylthreonylphenylalanylglutamylseryl-methionylserylglycylleucylvalyltryptophylthreonylserylalanylprolylalanylserine(1185 letters) - the scientific name for the Tobacco Mosaic Virus

Methionylglutaminylarginytyrosylglutamylserylleucylphenylalanylalanylglutaminyll-eucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanyvalylprolylphenylalanyl-valythreonylleucylglycylaspartylprolyglycylisoleucylglutamylglutaminylserylleucyllysyl-isoleucylaspartylthreonylleucylisoleucylglutamylalanylglycylalanylaspartylalanylleucy-lglutamylleucylglycylglycylisoleucylprolylphenylalanylserylaspartylprolylleucelalanyla-spartyglycylprolythreonylisoleucylglutamiylasparaginylalanylthreonylleucylarginylala-nylphenylalanylalanylglycylvalyltheonylprolylalanylglutaminylcysteinylphenylalanygll-utamylmethionylleucyalanylleucylisoleucylarginylglutaminyllysylhistidylprolylthreonyl-isoleucylpriIylisoleucylglycylleucylleucylmethionyltyrosylalanylasparaginylleucylvalyp-henylalanylasparaginyllysylgyycylisoleucylaspartylglutamylphenylalanyltyrosylalanyl-gutaminyllcysteinylglutamyllysylvalylglycylavlylaspartylserylvalylleucylvalylalanylasp-artylvalyprolylvalylglutaminylglutamyllserylalanyprolyphenylalanylarginylglutaminylal-anylalanylleucylarginylhistidylasparaginylvaylalanylprolylisoleucylphenylalanylisoleu-cylcysteinylprolylprolylaspartylalanylaspartylaspartylaspartylleucylleucylarginyglutam-inylisoleucylalanyylseryltyrosylglycylarginylglycyltyrosylthreonyltyrosylleucylleucylser-ylarginylalanylglycylvalythreonylglycylalanylglutamylasparaginylarginylanylalanylleu-cylprolylleucylaspaaginylhistidylleucylvaylalanyllysylleucyllysylglutamyltyrosylasarag-inylglycylphenylalanylglycylisoleucylalanylprolylaspartylglutaminylvalyllysylalanylala-nylisoleucylaspartylalanylalanyglycylalanylalanyglycylalanylisoleucylserylglycyseryla-lanylisoleucylbalyllsylisoleucylisoleucylglutamyyylglutaminylhistidylasparaginylisole-ucylglutamylprolyglutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalaby-lvalylglutaminlylprolylmethionyllysylalanylalanylthreonylarginylserine(1909 letters) - Scientific name for Trypthophan synthetase (that is a protien with 267 amino acids)

Deoxyribonucleic acid(DNA) is alleged to have 207000 letters, but has never been printed in full.