Jisho

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Wikipedia definition
1. Geographic tongueGeographic tongue, an inflammatory condition of the tongue affecting approximately 2% of the population, is characterized by discolored regions of taste buds or sometimes even cracks in the surface of the tongue. The condition is usually chronic, and frequently manifests after eating any of a range of exacerbating foods, or during times of stress, illness, or hormonal surges (particularly in women just before menstruating).
Read “Geographic tongue” on English Wikipedia
Read “地図状舌” on Japanese Wikipedia
Read “Geographic tongue” on DBpedia

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