Longest word in English without repeated letter

What is the longest word you can come up with that is a real English word that doesn't use any individual letter more than once?

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The usual answer (longer than nohat's discoveries, probably because the CMU dictionary doesn't contain it, but certainly a valid English word) is "UNCOPYRIGHTABLE", 15 letters.

Dermatology journals also contain the word SUBDERMATOGLYPHIC, 17 letters.

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I thought I said "uncopyrightable" somewhere. –  Arlen Beiler Aug 20 '10 at 18:44
What dermatology journals? There is only one I know of in which the word appears, and that is Archives of Dermatology (now JAMA Dermatology). If you know of others, I would be interested in seeing the citations. –  Psychonaut Dec 9 '14 at 14:40
An anonymous user suggested an edit rewriting this answer to include the word "hydropneumatics"; I'm just placing the word as a comment here. –  ShreevatsaR Mar 25 at 2:21

I wrote a quick little Perl script to scan through the CMU Pronouncing Dictionary:

#!/usr/local/bin/perl
use warnings;
use strict;
use Data::Dumper;
my @size;
while (<>) {
my ($word) = split / /,$_;
next unless $word =~ m/^[A-Z]+$/;
my @letters = split //, $word; my %count;$count{$_}++ foreach @letters; next if grep {$_ > 1 } values %count;
push @{$size[length($word)]}, $word; } print Dumper(pop @size);  Here is the output: $VAR1 = [
'UNPREDICTABLY',
'WOLFENSCHMIDT'
];


The third is debatably an English word—it’s a name—but they are all 13 letters long.

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+1 for being able to do write a quick, little Perl script like that –  Edward Tanguay Aug 13 '10 at 23:31
far more fun than the real programming I'm supposed to be doing :-) –  nohat Aug 13 '10 at 23:37
+1 for the code –  Vincent McNabb Aug 14 '10 at 0:15
+1 for resisting the temptation to write a one-liner. :-) –  ShreevatsaR Aug 14 '10 at 2:03
Sounds like the StackOverflow crowd found the site. –  JohnFx Aug 14 '10 at 15:13

You can take a look at wikipedia: Isogram

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Are "misconjugatedly" and "troublemakings" really words? –  delete Aug 14 '10 at 2:33
@Shinto: I'm not sure with "misconjugatedly" but "troublemakings" is obviously word, at least it's in my Merriam-Webster dictionary. =) –  Anonymous Aug 14 '10 at 2:57

A quick Google search revealed a post with the following list:

• 15,"dermatoglyphics"
• 14,"troublemakings"
• 14,"dermatoglyphic"
• 14,"ambidextrously"
• 13,"documentarily"
• 13,"consumptively"
• 13,"endolymphatic"
• 13,"flowchartings"
• 13,"hydromagnetic"
• 13,"lycanthropies"
• 13,"troublemaking"
• 13,"unpredictably"
• 13,"unproblematic"
• 13,"subordinately"
• 13,"metalworkings"
• 13,"multibranched"
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A popular trivia quiz question along these lines is 'what is the longest place name in Britain that doesn't repeat any letters?' Nobody has yet found one longer than 'Bricklehampton'.

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From Fun with Words:

The longest words with no repeated letters are dermatoglyphics, misconjugatedly and uncopyrightables.

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In the dictionaries which come with FreeBSD I find:

• 14: ambidextrously
• 14: benzhydroxamic
• 15: dermatoglyphics
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I majored in dermatoglyphics in college. –  Chris Dwyer Sep 13 '10 at 22:06