means The soft, reflective sheen or glow of a surface, or by extension a kind of radiant distinction or glory.

from From Latin 'lustrare,' to illuminate or brighten, which traveled through Italian 'lustro' and French 'lustre' before reaching English in the 1500s. The root is tied to 'lux,' light — the same family that gives us 'illustrate' and 'illustrious,' all of them words about throwing light on something. Curiously, Latin had a separate 'lustrum' meaning a purification ceremony held every five years; the two senses may share an older root in the idea of making clean and bright, though scholars don't agree on the connection.