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heliocentric
heliocentric parallax
heliodor
heliograph
heliolatry
heliolithic
heliometer
heliopause
heliophyte
Heliopolis
Helios
helioseismology
heliosphere
heliostat
heliotaxis
heliotherapy
heliotrope
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helium flash
he·li·um flash (plural he·li·um flash·es)


noun 
Definition:
 
beginning of helium burning in star: the sudden onset of fusion reactions using helium as fuel in a star that has no hydrogen left to burn, resulting in expansion of the star's core
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