An isogram (also known as a "nonpattern word") is a logological term for a word or phrase without a repeating letter. It is also used by some to mean a word or phrase in which each letter appears the same number of times, not necessarily just once.
In the book Language on Vacation: An Olio of Orthographical Oddities, Dmitri Borgmann tries to find the longest isogrammic word. The longest one he found was "Dermatoglyphics" at 15 letters. He coins several longer hypothetical words, such as "thumbscrew-japingly" (18 letters, defined as "as if mocking a thumbscrew") and, with the "uttermost limit in the way of verbal creativeness", "pubvexingfjord-schmaltzy" (23 letters, defined as "as if in the manner of the extreme sentimentalism generated in some individuals by the sight of a majestic fjord, which sentimentalism is annoying to the clientele of an English inn").
In the book Making the Alphabet Dance, Ross Eckler reports the word "subdermatoglyphic" (17 letters) can be found in Lowell Goldmith's article Chaos: To See a World in a Grain of Sand and a Heaven in a Wild Flower. He also found the name "Melvin Schwarzkopf" (17 letters), a man living in Alton, Illinois, and proposed the name "Emily Jung Schwartzkopf" (21 letters). In an elaborate story, Eckler talked about a group of scientists who name the unavoidable urge to speak in pangrams the "Hjelmqvist-Gryb-Zock-Pfund-Wax syndrome".
The longest German isogram is "Heizölrückstoßabdämpfung" (heating oil recoil dampening) with 24 letters, closely followed by "Boxkampfjuryschützlinge" (box fight jury fosterlings) and "Zwölftonmusikbücherjagd" (twelve-tone music book chase) with 23 letters.
Isograms are especially useful in the game of Hangman, or would make a particularly difficult puzzle on the game show Wheel of Fortune.
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isogram — [ī′sō gram΄, ī′səgram΄] n. [ ISO + GRAM] a line on a particular surface, as on a map, that represents a constant or equal value of a given quantity … English World dictionary
isogram — noun Date: 1889 isoline … New Collegiate Dictionary
isogram — a map line connecting all points having the same anything. Also called isoline … Dictionary of ichthyology
isogram — /uy seuh gram /, n. Meteorol., Geog. a line representing equality with respect to a given variable, used to relate points on maps, charts, etc. Also called isoline. [1885 90; ISO + GRAM1] * * * … Universalium
isogram — noun a) A word or phrase in which each letter occurs the same number of times b) A line on a chart, such as a contour line, joining points that have the save value for some quantity … Wiktionary
isogram — line connecting points on a map having some similar feature Contour Lines … Phrontistery dictionary
isogram — iso·gram … English syllables
isogram — i•so•gram [[t]ˈaɪ səˌgræm[/t]] n. geo a line representing equality with respect to a given variable, used to relate points on maps, charts, etc • Etymology: 1885–90 … From formal English to slang
isogram — /ˈaɪsəgræm/ (say uysuhgram) noun → isopleth … Australian English dictionary
isogram — n. line on map passing through all places with same conditions or figures for the subject in question, as temperature, rainfall, etc … Dictionary of difficult words