About
The character 疸 is a phono-semantic compound whose semantic radical 疒, meaning 'sickness' or 'disease', forms an enclosure on the top and left, and whose phonetic component 旦 (dàn) supplies the sound, shifting to dǎn. It is used exclusively to refer to jaundice, a medical condition characterized by yellowing of the skin and whites of the eyes due to high bilirubin. The character almost always appears in the word 黄疸 (literally 'yellow jaundice'), where the sickness radical firmly places it in the medical lexicon.
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