Veltino

The Veltino were a race who knew of K37J5 and Krop Tor. They named the planet The Bitter Pill, as the black hole was supposed to be a mighty demon that was tricked into devouring the planet, only to spit it out because it was poison. From this it can be deduced that in the Veltino language, the word "krop" means either "bitter" or "pill", and "tor" means either "pill" or "bitter". (DW: The Impossible Planet)