Lustrous means having a soft, glowing shine. A lustrous surface reflects light in a gentle, appealing way, like polished wood, healthy hair, or a pearl. Think of how a freshly waxed car gleams in the sunlight, or how a cat's fur looks silky and shiny when it's well-groomed.

Something lustrous doesn't have to be mirror-bright or glittery. Instead, it has a rich, smooth glow that catches your eye without being harsh or flashy. A musician's well-maintained brass instrument has a lustrous finish. Dark, healthy hair is often described as lustrous because of how it reflects light.

Writers often use lustrous to describe precious materials: lustrous silk, lustrous pearls, lustrous mahogany. The word suggests both beauty and quality. When something is lustrous, you can tell it's been cared for or is made of good material. It's the kind of shine that makes you want to reach out and touch it to see if it feels as smooth as it looks.