svetelného
svetelného is a Czech word that translates to "of light" or "luminous" in English. It is the genitive masculine singular form of the adjective svetelný. This adjective is used to describe something that emits or reflects light, or is related to light in some way.
For example, in Czech, one might refer to the "svetelného zdroje" which means "light source." Similarly, "svetelného