Definitions
carboxyl radical (chemistry)
Etymology
About
The character 羧 is a phono-semantic compound: the semantic radical 羊 (sheep/goat) provides the category, while the phonetic component 夋 indicates its original pronunciation. It initially referred to a type of sheep or a related animal characteristic. In modern scientific usage, however, it was repurposed to denote the carboxyl group in organic chemistry, leveraging its phonetic similarity to the Chinese terms for oxygen and acid. Although its structural components remain linked to the animal kingdom, its meaning is now entirely chemical, representing a deliberate adaptation of a rare character for precise scientific terminology.