euein
euein is a term that can refer to a few different things, primarily in the context of ancient Greek culture and language. In the context of ancient Greek tragedy, euein (εὐοῖ) was an ecstatic cry or exclamation associated with the worship of Dionysus, the god of wine, revelry, and fertility. It was often uttered by the maenads, the female followers of Dionysus, during their ecstatic rituals and dances. The sound itself is believed to have been an onomatopoeic representation of a cry of joy or religious fervor.
The word can also appear in more general ancient Greek contexts. Its root components are "eu" (εὖ)