hetaera (n.)youdaoicibaDictYouDict[hetaera 词源字典]
1820, "mistress," from Medieval Latin hetaera, from Greek hetaira "female companion," in Athens opposed to "lawful wife," and thus embracing everything from "concubine" to "courtesan;" fem. of hetairos "comrade, companion," from PIE *swet-aro-, suffixed form of root *s(w)e- (see idiom).[hetaera etymology, hetaera origin, 英语词源]