ˈhɪɹ.oʊ ˈhɪə.ɹəʊ ˈhɛɹ.oʊ ˈhɛɹən (Greek mythology) priestess of Aphrodite who killed herself when her lover Leander drowned while trying to swim the Hellespont to see her Greek mathematician and inventor who devised a way to determine the area of a triangle and who described various mechanical devices (first century)