isograph

[ ahy-suh-graf, -grahf ]

noun

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

Other Words From

• i·so·graph·ic [ahy-s, uh, -, graf, -ik], iso·graphi·cal adjective
• iso·graphi·cal·ly adverb

Word History and Origins

Origin of isograph¹

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