Pronunciation: (nOO"klē-ō-sin'thu-sis, nyOO"-), [key]
—n. Physics, Astron.
the formation of new atomic nuclei by nuclear reactions, thought to occur in the interiors of stars and in the early stages of development of the universe.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.