glaze, enamel
釉 centers on a smooth, glassy coating applied to ceramics: a glaze or enamel that fuses to the surface during firing.
釉 combines 采 (originally related to picking or coloring) with 由, which likely contributes the sound. The character refers to the glossy coating on pottery, but the exact historical development of the components is uncertain.
The left side 采 suggests picking or applying something, and the right side 由 looks like a container. Imagine dipping a pot into a container of glossy liquid to coat it with glaze.
For ユウ, picture you applying glaze to a ceramic piece: you -> ユウ, and your careful work creates a shiny enamel finish.
glaze; enamel
glazing (ceramics)
ash glaze (type of fundamental glaze used in ancient times made from the ashes of raw materials such as unhulled rice, straw, oak and pine)
unglazed (e.g. pottery)
iron glaze (pottery)
lead glaze (porcelain manuf.)
copper glaze (pottery)