(n) (Greek mythology) the beautiful daughter of Zeus and Leda who was abducted by Paris; the Greek army sailed to Troy to get her back which resulted in the Trojan War, Syn. Helen of Troy
n. (Chem.) A neutral organic substance found in the root of the elecampane (Inula helenium), and extracted as a white crystalline or oily material, with a slightly bitter taste. [ 1913 Webster ]