brilliantyoudaoicibaDictYouDict[brilliant 词源字典]
brilliant: [17] Brilliant comes from French brilliant, the present participle of briller ‘shine’. French borrowed the verb from Italian brillare, but it is not altogether clear where Italian got it from. One theory is that it came from Vulgar Latin *bērillāre, a derivative of bērillus ‘precious stone’ (whence English beryl [13]). The source of the Latin noun was Greek bérullos, which may have come from one of the Indo-European languages of India (Sanskrit vaidūrya ‘cat’s-eye’ has been compared).
[brilliant etymology, brilliant origin, 英语词源]
brilliant (adj.)youdaoicibaDictYouDict
1680s, from French brilliant "sparkling, shining" present participle of briller "to shine" (16c.), from Italian brillare "sparkle, whirl," perhaps from Vulgar Latin *berillare "to shine like a beryl," from berillus "beryl, precious stone," from Latin beryllus (see beryl). In reference to diamonds (1680s) it means a flat-topped cut invented 17c. by Venetian cutter Vincenzo Peruzzi.