<P> Antidisestablishmentarianism is the longest common example of a word formed by agglutinative construction . </P> <P> A number of scientific naming schemes can be used to generate arbitrarily long words . </P> <P> The IUPAC nomenclature for organic chemical compounds is open - ended, giving rise to the 189,819 - letter chemical name Methionylthreonylthreonyl...isoleucine for the protein also known as titin, which is involved in striated muscle formation . In nature, DNA molecules can be much bigger than protein molecules and therefore potentially be referred to with much longer chemical names . For example, the wheat chromosome 3B contains almost 1 billion base pairs, so the sequence of one of its strands, if written out in full like Adenilyladenilylguanilylcystidylthymidyl..., would be about 8 billion letters long . The longest published word, Acetylseryltyrosylseryliso...serine, referring to the coat protein of a certain strain of tobacco mosaic virus, was 1,185 - letters long, and appeared in the American Chemical Society's Chemical Abstracts Service in 1964 and 1966 . In 1965, the Chemical Abstracts Service overhauled its naming system and started discouraging excessively long names . </P> <P> John Horton Conway and Landon Curt Noll developed an open - ended system for naming powers of 10, in which one sexmilliaquingentsexagintillion, coming from the Latin name for 6560, is the name for 10 = 10 . Under the long number scale, it would be 10 = 10 . Jonathan Bowers has developed a system for even larger numbers (enneenneconteennahecteika - enneenneconteennahectenedaka - enneenneconteennahecteyodaka - enneenneconteennahectezedaka - enneenneconteennahecteexdaka - enneenneconteennahectepedaka - enneennecontehectetedaka - enneenneconteennahectetradaka - enneenneconteennahectedoka - enneenneconteennahectehendaka - enneenneconteennahectedaka - enneenneconteennahectexenna - enneenneconteennahecteyotta - enneenneconteennahectezetta - enneenneconteennahecteexa - enneenneconteennahectepeta - enneenneconteennahectetera - enneenneconteennahectegiga - enneenneconteennahectemega - enneenneconteennahectekilla - enneenneconteennahectillion for 10 3 ∗ 10 3 ∗ 10 63 − 3 + 3 (\ displaystyle 10 ^ (3 * 10 ^ (3 * 10 ^ (63) - 3) + 3))). </P>

What is the longest english word in the world