Hyawdʰ- (Proto-Indo-Iranian) comes from Proto-Indo-European Hyewdʰ-, from Proto-Indo-European h₂yew-, from Proto-Indo-European h₂óyu, from Proto-Indo-European h₂ey- — vital force, life, age, eternity; day, morning.
Hyawdʰ- (Proto-Indo-Iranian): to fight, to battle; to struggle