Avastanud
Avastanud is an Estonian word that functions as the active past participle of the verb avastama, meaning to discover. It describes someone or something that has already completed the act of discovering, or it can be used in a verbal sense to form compound tenses such as the present perfect (ta on avastanud = he has discovered). As an adjective, avastanud can modify a noun and is used in attributive position, for example in phrases like avastanud teadlane or avastanud meetod, though in natural prose it is more common to use a relative clause such as teadlane, kes on avastanud… to convey the same idea.
In grammar, avastanud patterns with other Estonian participles: it does not vary by gender, but it does
Etymologically, avastanud is formed from the verb avastama with the standard active past participle suffix -nud,