iso·​gloss ˈī-sə-ˌgläs How to pronounce isogloss (audio)
: a boundary line between places or regions that differ in a particular linguistic feature
: a line on a map representing an isogloss
isoglossal adjective
isoglossic adjective

Word History


International Scientific Vocabulary is- + Greek glōssa language — more at gloss

First Known Use

1925, in the meaning defined at sense 1

Time Traveler
The first known use of isogloss was in 1925

Dictionary Entries Near isogloss

Cite this Entry

“Isogloss.” Dictionary, Merriam-Webster, Accessed 11 Dec. 2023.

More from Merriam-Webster on isogloss

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