(video games) Initialism of in-game name.

plural of IGN

plural of ignis fatuus

(dermatology) A skin condition caused by long-term exposure to heat (infrared radiation).

(archaic) Fiery; of or pertaining to fire.

(rare) The quality or condition of being igneous.

(archaic) Formed by heat and water; denoting an obsolete theory of the formation of granite

Emitting sparks of fire when struck with steel; scintillating.

A stone that emits sparks of fire when struck with steel.

Pertaining to or having the nature of fire; containing fire; resembling fire. / (geology) Resulting from, or produced by, great heat. With rocks, it could also mean formed from lava or magma.