producing light: the luminiferous properties of a gas.

What is the definition of Luminiferous?

: transmitting, producing, or yielding light.

What does aether mean?

The Latin root is aether, which means "the upper pure, bright air." Ether was originally a scientific term for what 19th century physicists called "the fifth element," a substance that was said to fill all space and make up all bodies. In modern times, ether has come to be a literary term that refers to the sky.