Treated with or covered in brilliantine; having a glossy, shiny appearance from the use of hair product.
From 'brilliantine' plus the past participle suffix '-ed,' describing the state of having had brilliantine applied.
A 'brilliantined' gentleman in the 1920s was signaling that he took pride in his appearance and could afford grooming products—it was a small status symbol visible whenever sunlight caught his perfectly slicked hair.
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