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蚋 functions as a phono-semantic compound, combining the insect radical 虫 (which denotes insects, bugs, and crawling creatures) on the left with the phonetic 内 (also written 內) on the right to indicate the sound. It was coined specifically for small, biting flying insects, chiefly blackflies and gnats, pests commonly found in damp environments. The semantic component places the character squarely in the zoological and entomological vocabulary; it is used almost exclusively in scientific or descriptive contexts to refer to these dipterous insects, carrying a precise biological definition and never acquiring extended or metaphorical meanings in the general lexicon.
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