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瘘 is a phono-semantic compound: the radical 疒 places it in the semantic category of diseases and medical conditions, while the phonetic was originally 婁 in the traditional form 瘺, later simplified to 娄. It denotes a fistula, ulcer, or persistent sore, an abnormal bodily passage or wound that continuously discharges fluids. In historical medical texts, the character served as a precise diagnostic term for chronic localized infections, rather than a broad colloquial usage.
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