i 1 s 1 o 1 g 2 r 1 a 1 m 3
7 letters · 10 points in Scrabble
Meaning
noun a line drawn on a map connecting points having the same numerical value of some variable
originFrom iso- + -gram. The "contour line" sense was proposed in 1889 by Francis Galton.
Etymology from Wiktionary, CC BY-SA 3.0