Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
drăcōnĭgĕna, ae, comm. [dracogigno], dragon-born (poet.): urbs, i. e. Thebes, Ov. F. 3, 865: hostis, i. e. Alexander the Great (whom Olympias was said to have conceived by a serpent, acc. to Just. 11, 11, 3; 12, 16, 2), Sid. Carm. 2, 80.