'lustrous' originates from Latin, specifically the word 'lustrare,' where 'lustrare' meant 'to illuminate or brighten.'

'lustrare' transformed into the Old French word 'lustre,' and eventually became the modern English word 'lustrous' through Middle English.

Initially, it meant 'to illuminate or brighten,' but over time it evolved into its current meaning of 'having a sheen or gloss.'