ant eggs
蚳 refers specifically to ant eggs, a rare and narrow meaning with no broader conceptual center beyond this single biological item.
蚳 combines 虫 (insect) with 氐, which likely provides the sound. The character was created to name ant eggs specifically.
The insect radical 虫 sits beside 氐, like a tiny ant egg nestled next to its nest. Picture a cluster of ant eggs being tended by worker ants.
For チ, imagine a tiny ant egg hatching with a soft 'chee' sound: chee -> チ, and the egg is an ant egg.
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