Wiktionary
n. (context physics English) nuclear fusion involving helium nucleus.
Usage examples of "helium fusion".
For instance the deuterium-helium fusion reaction is about as low-energy and clunky as you can get.
Her spectroscopic probing of low cross-section helium fusion at the center of that perfect spiral galaxy had to end.
I had in mind some kind of ignition mechanism, one that would turn the planet, which is largely hydrogen, into a vast bomb using hydrogen-to-helium fusion.
Because gram for gram, an annihilation reaction produces about one hundred forty times the energy of, say, hydrogen-helium fusion.
Hydrogen-helium fusion reactors produced more, over the course of many millions of years.
The sun uses up its hydrogen, its core collapses, helium fusion begins, and it balloons into a red giant.