About
The character 蚜 (yá) is a phonosemantic compound formed by the insect radical 虫 (chóng) and the phonetic component 牙 (yá, meaning 'tooth'). The radical explicitly assigns it to the category of insects, worms, and similar creeping creatures, while 牙 supplies the pronunciation. It was created as an entomological term for a group of minuscule, sap-sucking pests that infest plants, the most familiar being the aphid, or yáchóng (蚜虫), which historically devastated crops. The character's use is entirely literal and confined to biology, with no figurative or abstract meanings, exemplifying the radical-phonetic system's power for precise scientific classification.
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