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isolex
isolex n.
Brit. 
/ˈʌɪsə(ʊ)lɛks/
, /ˈʌɪsə(ʊ)lɛks/U.S. /ˈaɪsəˌlɛks/
Linguistics a line connecting places in which there is uniformity of vocabulary./ˈaɪsəˌlɛks/ΘΚΠ
the mind > language > linguistics > other schools of linguistics > [noun] > linguistic geography or dialectology > isogloss > specific
isolex1921
isomorph1921
isophone1921
isograph1939
1921 Jrnl. Eng. & Germanic Philol. 20 182 There is danger in delay if certain phases of dialect life are to be recorded at all, and an accelerated pace in registering them would be advisable, especially in establishing the boundary lines of present dialects, with their maze of isophones, isomorphs, isolexes, and isotaxes, i.e., lines connecting places of identical or nearly identical sounds, forms, words, and syntactical peculiarities.
1963 Amer. Speech 38 127 The regional diversity and the complicated grid of isolexes in the Northern counties.
1963 Amer. Speech 38 128 Any attempt to correlate the isolexes with demographic factors.
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