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[noo-klee-oh-sin-thuh-sis, nyoo-] /ˌnu kli oʊˈsɪn θə sɪs, ˌnyu-/
noun, Physics, Astronomy
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.
1955-60; nucleo- + synthesis
Related forms
[noo-klee-oh-sin-thet-ik, nyoo-] /ˌnu kli oʊ sɪnˈθɛt ɪk, ˌnyu-/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for nucleosynthesis
  • Reference material and stellar nucleosynthesis reaction and decay rates.
  • The nucleosynthesis processes that produced the elements created both stable and unstable nuclides.
  • Initial experiments in areas such as materials science, nucleosynthesis, and supernova hydrodynamics have been conducted.
  • The baryon density is also constrained by the nucleosynthesis models of the early universe.
British Dictionary definitions for nucleosynthesis


(astronomy) the formation of heavier elements from lighter elements by nuclear fusion in stars
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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nucleosynthesis in Science
The process by which heavier chemical elements are synthesized in the interiors of stars from hydrogen nuclei and other previously synthesized elements. Precisely which elements are involved in nucleosynthesis depends on the age and mass of the star. The most prevalent reaction in smaller stars like our Sun is the fusion of hydrogen into helium by the proton-proton chain; in more massive stars this fusion occurs via the carbon cycle. When a star is burning hydrogen in its core, it is a main-sequence star. In older stars such as the red giants, nucleosynthesis involves the burning of heavier elements created by earlier fusion; for example, helium may burn via the triple alpha process. More massive stars—over eight solar masses—also fuse carbon into neon and magnesium, oxygen into silicon and sulfur, and silicon into iron. The nucleosynthesis of iron is the precursor to the transition into the supernova phase.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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