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啶 (dìng) is a modern phono-semantic compound created for scientific nomenclature. Its left side is the mouth radical 口, a conventional marker in Chinese chemical terms for phonetic transliterations of foreign organic compounds; the right side is the phonetic 定 (dìng). Unlike characters with classical origins, it was coined to designate nitrogen-containing organic ring structures. It is found almost exclusively in the transliterated name 吡啶 (bǐdìng), the standard Chinese term for pyridine, a basic heterocyclic organic compound, where it functions purely as a phonetic unit in the standardized vocabulary of organic chemistry.
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