ljósvaki (n)

“ether/æther”

For those of you who aren’t familiar with the concept, the ether was a proposed concept in medieval science that was defined as the material that filled the universe above the terrestrial sphere. In the 17th an 18th centuries there were theories that proposed
the ether was a carrier of light, and then in the late 19th century something called “luminiferous æther” was defined as a medium for the spreading, or propagation, of light.  This shaped the compound that we now know today as ljósvaki, or “ljós” meaning light and “vaki” meaning an awakener, inducer, or conjurer.

A conjurer of light.