isogram

Meaning

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.

Synonyms

isarithm

isopleth

isoneph

contour chart

isoline map

constant value line

contour

magnitude contours

isoline

Etymology

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