I. lus ‧ ter /ˈlʌstə $ -ər/ BrE AmE noun [singular, uncountable]
[ Date: 1500-1600 ; Language: French ; Origin: lustre , from Old Italian lustro , from Latin lustrare 'to brighten' ]
the American spelling of ↑ lustre
II. lus ‧ tre BrE AmE British English , luster American English /ˈlʌstə $ -ər/ noun [singular, uncountable]
1 . an attractive shiny appearance:
Her thick, black hair shone with lustre.
2 . the quality that makes something interesting or exciting:
There’ll be a celebrity guest to add lustre to the occasion.