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As a phono-semantic compound, 炷 uses the fire radical 火 on the left to associate it with burning, flames, and light. The right component 主 serves as the phonetic marker, indicating the character’s pronunciation. Originally, 炷 referred specifically to the wick of an oil lamp or candle, the part sustaining the flame. Its meaning later extended to function as a measure word for counting lit objects, especially sticks of incense in religious or ceremonial settings. Thus, the character is used in contexts related to lighting, burning wicks, and quantifying incense offerings.
Etymology Hide
