BRILL'IANT, adjective [Eng. beryl and pearl.] 1. Sparkling with luster; glittering; as a brilliant gem; a brilliant dress. 2. Splendid; shining; as a brilliant achievement. Washington was more solicitous to avoid fatal mistakes, than to perform brilliant exploits. BRILL'IANT, noun A diamond of the finest cut, formed into angles, so as to refract the light, by which it is rendered more glittering. 1. In the manege, a brisk, high-spirited horse, with a stately carriage.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI