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The character 埚, with its traditional form 堝, is a phono-semantic compound. Its semantic radical 土 (earth, clay) indicates the material it describes, while the phonetic component 呙 provides its pronunciation. This structure reflects the character’s original meaning: a crucible, a ceramic or clay vessel designed to withstand extreme heat for melting metals or conducting chemical reactions. Throughout its history, 埚 has remained a specialized technical noun, referring exclusively to this type of metallurgical or laboratory apparatus without developing broader abstract meanings.