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isograph

American

[ahy-suh-graf, -grahf] / ˈaɪ səˌgræf, -ˌgrɑf /

noun

(in the study of the geographical distribution of a dialect) a line drawn on a map to indicate areas having common linguistic characteristics.

First recorded in 1935–40; iso- + -graph

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023