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The character 蚴 is structured as a phono-semantic compound, combining the insect radical 虫 with the component 幼, which signifies youth and provides phonetic guidance, etymologically pointing to the concept of a juvenile insect or larva. Historically used in classical texts to denote grubs or immature worms, its meaning has specialized over time, now primarily appearing in scientific contexts like parasitology to specify larval stages of parasites, such as in the terms miracidium (毛蚴) or cercaria (尾蚴).