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Meaning of helium variable | Babel Free

Noun CEFR B2

Definitions

A star in which the strength of the helium absorption lines vary periodically; at times appearing to be a helium star.

CEFR level

B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
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See also

helium-3 helium-4 heliumide Helix Helixes helixing

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