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isograph

[ahy-suh-graf, -grahf]
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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.

Origin of isograph

First recorded in 1935–40; iso- + -graph
Related formsi·so·graph·ic [ahy-suh-graf-ik] /ˌaɪ səˈgræf ɪk/, i·so·graph·i·cal, adjectivei·so·graph·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018