1. adjective
the brilliant lights along the promenade
butterflies with brilliant blue wings
Syn: glittering, shining, excellent, distinctive, striking, superb, exceptional, glorious, magnificent, marvellous, marvelous, splendid, wonderful, brainy, ingenious
2. noun
, 1891: “And the ring?” I asked, glancing at a remarkable brilliant which sparkled upon his finger. — Arthur Conan Doyle, ‘A Case Of Identity’ (Norton 2005 p.76)
b) brilliant.
Wikipedia foundation.