clear, pure water, lucid, glossy
瀅 centers on water that is perfectly clear and pure, giving a lucid, glossy appearance. The meanings all describe a state of transparent, unclouded liquid.
瀅 combines the water radical 氵 with 瑩, which itself contains 王 (jade) and 火 (fire) under a cover. 瑩 likely contributes the sound and the idea of glossy brightness, suggesting water as clear as polished jade.
Water 氵 beside 瑩, a character associated with gleaming jade. Imagine a stream so pure it reflects light like polished gemstones, making the water look glossy and lucid.
For エイ, picture a clear, glossy lake reflecting the letter 'A': A -> エイ, and the water is so pure you can see the reflection perfectly.