Definify.com

Webster 1913 Edition

Adj.

[L.

ignescens

, p. pr. of

ignescere

to become inflamed, fr.

ignis

fire: cf. F.

ignescent

Emitting sparks of fire when struck with steel; scintillating;

as,

ignescent

stones

Adj.

[L. ignescens, ignesco, from ignis, fire.]

Emitting sparks of fire when struck with steel; scintillating; as ignescent stones.

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.