# isogram

> English word · Noun

## Definitions
1. A word in which no letter of the alphabet occurs more than once.
2. A line on a map or chart, such as a contour line, joining points that have the same value for some quantity.

## Etymology
From iso- + -gram. The "contour line" sense was proposed in 1889 by Francis Galton.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/isogram