The Collaborative International Dictionary of English v.0.48:
Ninigi \Ninigi\, Ninigino-Mikoto \Ninigino-Mikoto\prop. n. The grandson of Amaterasu and first ruler of Japan. [WordNet 1.5] NinkharsagWordNet (r) 3.0 (2006):
Ninigi n 1: grandson of Amaterasu and first ruler of Japan [syn: Ninigi, Ninigino-Mikoto]