The name of the star is Wormwood. A third of the waters turned bitter like wormwood oil, and many people died from the bitter waters.
KJV
And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.
ASV
and the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.