supergiant

Definitions of supergiant
1

n an extremely bright star of very large diameter and low density

Examples:
Alpha Orionis
the second brightest star in Orion
Canopus
supergiant star 650 light years from Earth; second brightest star in the sky
Type of:
star
(astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior

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