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胍 is a phono-semantic compound character: the left-side semantic radical 月 (the 'flesh' radical) indicates a body part or, in its chemical usage, an organic compound, while the right-side phonetic element 瓜 (guā) supplies the pronunciation. The character was created in modern times as a phonetic borrowing, specifically coined to transcribe the name of the organic nitrogenous base guanidine into Chinese. As a specialized scientific term, 胍 functions exclusively within the realm of organic chemistry and medicine; it appears only in chemical formulas, medical texts, and the technical literature on organic nitrogenous compounds, carrying no meaning beyond that narrow context.
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