【分享】The world's longest english word.
Methionylglutaminy...serine is a scientific name for tryptophan synthase, which is made up of 267 amino acids. It has appeared written down a number of times and has 1913 letters.
According to the Guinness Book of World Records, 18th edition, it is the longest chemical word for C 1289H2051N343O375S8.
Lots of much larger proteins exist and their "scientific names" can be written in the same way. If nobody has actually bothered to write down such a scientific name, it is a fine metaphysical point whether the names should be said to exist, and if not, whether this particular string of letters representing a rather average, modest-sized protein is better qualified to be called a "word".
The full name, containing 1913 letters (excluding any dashes), is:
methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanyl-
glutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanyl-
valylprolylphenylalanylvalylthreonylleucylglycylaspartylprolylglycyl-
isoleucylglutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucyl-
isoleucylglutamylalanylglycylalanylaspartylalanylleucylglutamylleucyl-
glycylisoleucylprolylphenylalanylserylaspartylprolylleucylalanylaspartyl-
glycylprolylthreonylisoleucylglutaminylasparaginylalanylthreonylleucyl-
arginylalanylphenylalanylalanylalanylglycylvalylthreonylprolylalanyl-
glutaminylcysteinylphenylalanylglutamylmethionylleucylalanylleucyl-
isoleucylarginylglutaminyllysylhistidylprolylthreonylisoleucylprolyl-
isoleucylglycylleucylleucylmethionyltyrosylalanylasparaginylleucylvalyl-
phenylalanylasparaginyllysylglycylisoleucylaspartylglutamylphenylalanyl-
tyrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspartylseryl-
valylleucylvalylalanylaspartylvalylprolylvalylglutaminylglutamylseryl-
alanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginylhistidyl-
asparaginylvalylalanylprolylisoleucylphenylalanylisoleucylcysteinylprolyl-
prolylaspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminyl-
isoleucylalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrosylleucyl-
leucylserylarginylalanylglycylvalylthreonylglycylalanylglutamylasparaginyl-
arginylalanylalanylleucylprolylleucylasparaginylhistidylleucylvalylalanyl-
lysylleucyllysylglutamyltyrosylasparaginylalanylalanylprolylprolylleucyl-
glutaminylglycylphenylalanylglycylisoleucylserylalanylprolylaspartyl-
glutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanyl-
glycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoleucyl-
isoleucylglutamylglutaminylhistidylasparaginylisoleucylglutamylprolyl-
glutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanylvalyl-
glutaminylprolylmethionyllysylalanylalanylthreonylarginylserine
"Official" longest word
The Guinness Book of Records, in its 1992 and subsequent editions, declared the "longest real word" in the English language to be floccinaucinihilipilification at 29 letters. Defined as the act of estimating (something) as worthless, its usage has been recorded as far back as 1741. In recent times its usage has been recorded in the proceedings of the United States Senate by Senator Jesse Helms, and at the White House by Bill Clinton's press secretary Mike McCurry, albeit sarcastically. It is the longest non-technical word in the first edition of the Oxford English Dictionary. The acceptability of the 33-letter adverbial form floccinaucinihilipilificastically is subject to controversy
