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The character 埚 (traditional 堝) is a phono-semantic compound: the semantic radical 土 signifies earth or clay, while the phonetic 呙 indicates the pronunciation. The presence of the earth radical alludes to the original material, as the character was created to name the crucible, a clay or ceramic vessel built to endure intense heat for melting metals or conducting chemical reactions. Since its inception, the meaning has remained narrowly technical, referring only to this metallurgical and laboratory apparatus and never branching into extended or abstract usage.
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