About
As a modern phono-semantic compound, 啶 (dìng) pairs the mouth radical 口 on the left, used in chemical nomenclature for phonetic transliteration, with the phonetic component 定 (dìng) on the right. Coincided for modern scientific translation, it represents nitrogen-containing organic ring structures. Its primary use is in bǐdìng (吡啶), the standard name for pyridine, a basic heterocyclic compound, showcasing its role as a specialized phonetic element in organic chemistry terminology.