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Etymology phono-semantic
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羟 is a modern character created solely to represent the hydroxyl radical (-OH) in chemistry, without any classical Chinese etymology. Simplified from 羥, it exemplifies chemical character construction by merging 羊 from 氧 (oxygen) with the phonetic component of 氢 (hydrogen), visually and conceptually capturing a group of one oxygen and one hydrogen atom. Its use is strictly limited to organic chemistry as a precise, unambiguous term for molecular structures, with no colloquial or non-scientific applications.
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