IGNES'CENT, adjective [Latin ignescens, ignesco, from ignis, fire.] Emitting sparks of fire when struck with steel; scintillating; as ignescent stones. IGNES'CENT, noun A stone or mineral that gives out sparks when struck with steel or iron. Many other stones, besides this class of ignescents, produce a real scintillation when struck against steel.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI