[ ahy-suh-graf, -grahf ]
/ ˈaɪ səˌgræf, -ˌgrɑf /
(in the study of the geographical distribution of a dialect) a line drawn on a map to indicate areas having common linguistic characteristics.
- isogonic line,
Origin of isograph
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019