The Longest Word in the Collins English Dictionary

Posted by Collins Language @ Wednesday 04 April 2012

What is the Longest Word in the Collins English Dictionary?

Watchstrap

The longest word in the dictionary is dichlorodiphenyltrichloroethane, which is the full name of the chemical DDT. It has 31 letters.

The longest word not containing the letter 'e' is the 21-letter psychopharmacological (relating to the study of drugs that affect the mind). There are six words containing five consecutive vowels; cooeeing, miaouing, miaoued, zoaeae and zoaeas, but no word contains six consecutive vowels.

The words sightscreen and watchstrap both contain six consecutive consonants.

What is the Longest Word with no Vowels?

There are four six-letter words with no vowel except 'y': rhythm, spryly, sylphy (of or like a slender graceful girl or young woman) and syzygy (a technical term used in astronomy). Rhythm can have an 's' added in the plural to make a seven-letter word without a vowel.

The longest words that contain no vowel including 'y' are crwth (a Celtic stringed instrument) and cwtch (a shed, cuddle, or hiding place). Both of these words are Welsh and treat the letter 'w' as a vowel.

Words Composed of Letters from the First or Second Half of the Alphabet

The longest word composed entirely of letters from the first half of the alphabet is the 12-letter fiddledeedee.

The longest word composed entirely of letters from the second half of the alphabet is zoosporous (a technical term used in biology).

Words from QWERTY Keyboard Rows

QWERTY Keyboard WordsThe common ten-letter words perpetuity, proprietor, repertoire, and typewriter can all be typed using only the top row of a QWERTY keyboard.

Two seven-letter words, alfalfa and shahada (the Islamic declaration of faith) can be typed using only the middle row of a QWERTY keyboard.


Words with Vowels in Alphabetical Order

The words abstemious and facetious are the only ones in which the five vowels 'a', 'e', 'i', 'o', and 'u' occur once each in their alphabetical order.

Words with 'X', 'Y', and 'Z' in Alphabetical Order

The words oxygenize and deoxygenize are the only ones in which the letters 'x', 'y', and 'z' occur once each in their alphabetical order.

Words with a Double 'J'

The only words containing a double 'j' are hajj (the pilgrimage to Mecca) and the related words hajji and hajjah.