wax, candle, waxy, glazed
蠟 centers on a waxy substance, typically from insects, used for candles, glazes, or coatings. The meanings all relate to wax or a waxy quality.
蠟 combines 虫 (insect) with 巤, which likely contributes the sound. The character originally referred to insect wax, such as beeswax.
The left side 虫 (insect) hints at the source: bees or other insects producing wax. The right side 巤 looks like a complex container, like a candle mold. Together, insect wax molded into a candle.
For ロウ, imagine a low-burning candle made of wax: low -> ロウ, and the wax candle glows softly.
wax made from fish oil; marine wax esters