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geographical tongue

(jē′ə-grăfĭ-kəl)
n.
  1. A chronic inflammation of the tongue characterized by distinct somewhat circular groupings of lesions bounded by a white band.benign migratory glossitis erythema migrans linguae pityriasis linguae
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.