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An isogram (also known as a non-patterned word) is a word in which every letter appears with identical frequency. In a first-order isogram, no letter is repeated at all.
The word "isogram" was coined by recreational linguist Dmitri Borgmann in his seminal 1965 book "Language on Vacation". The longest recognized first-order isogram in English without repeating letters is "subdermatoglyphic" (17 letters), followed by "uncopyrightables" (16 letters), and "dermatoglyphics" (15 letters). Second-order isograms (pair isograms), in which every letter appears exactly twice, include "intestines" and "reappear".
Pangrammatic champions containing zero duplicate letters
17-letter anatomical term without any repeated letters.
15-letter scientific noun for skin ridge patterning (fingerprints).
15-letter everyday adjective incapable of being copyrighted.
14-letter adverb denoting equal facility with both hands.
Test any English word to check if it has zero repeated letters:
Verified English words exemplifying isograms (non-repeating words) with Scrabble scores
Linguistic definitions, etymological origins, and tournament usage
An isogram is a word in which no letter repeats (first-order isogram), or in which every letter appears an equal number of times. For example, "dialogue" has 8 letters and each letter appears exactly once.