An object or material that's dyed has been colored with dye.
When we talk about something being "dyed", it usually means that someone has intentionally added color to it using dye. This can happen when you buy new clothes and they're still a bit pale - you might think, "These need a wash" but actually the manufacturer has deliberately left them looking slightly off-white so that the colors will show up better when you dye them later. People often talk about dyeing their hair too, which means changing its original color to something else.
To colour with dye, or as if with dye.
Coloured or tinted with dye, or as though therewith.
