from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A geographic boundary line delimiting the area in which a given linguistic feature occurs.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A line indicating the geographical boundaries of a linguistic feature on a map.


iso- + Greek glōssa, language, tongue.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From iso- +‎ Ancient Greek γλῶσσα. (Wiktionary)



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  • *snort*

    Pro, you're a gem.

    September 11, 2008

  • As in, Oh, Dr. Goodword, I'm so sorry I offended you with my suffixes. Apparently, the -ie isogloss just skirts your castle.

    September 10, 2008

  • Sure you will! Just walk around today finding excuses to use isogloss. It's a cinch! :-)

    September 10, 2008

  • Why are some of the prettiest words the ones I'll never, ever-ever-ever find occasion to use? *weeps*

    September 10, 2008

  • I'd imagine these would be relatively fluid and/or overlapping?

    June 20, 2007

  • A line drawn on a map to indicate the boundary where one sound or word stops being used and another begins to be used in its place.

    June 20, 2007