Etymology of the English word superharden
the English word superharden
using the English prefix super-
derived from the English word harden
derived from the English word hard
derived from the English word heard
derived from the English word hear
derived from the Proto-Germanic root *khauzjianan
derived from the Proto-Indo-European root *kous-
derived from the Proto-Indo-European root *kar-
derived from the Proto-Germanic root *kharthus
using the English suffix -en