[ ahy-suh-glos, -glaws ]
/ ˈaɪ səˌglɒs, -ˌglɔs /


(in the study of the geographical distribution of dialects) a line on a map marking the limits of an area within which a feature of speech occurs, as the use of a particular word or pronunciation.

Origin of isogloss

< German (1892); see iso-, gloss2

Related forms

i·so·glos·sal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for isogloss


/ (ˈaɪsəʊˌɡlɒs) /


a line drawn on a map around the area in which a linguistic feature is to be found, such as a particular pronunciation of a given word

Derived Forms

isoglossal or isoglottic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012