Definition of supergiant in US English:



  • A very large star that is even brighter than a giant, often despite being relatively cool.

    • ‘This is a blue supergiant star with luminosity 1,300 times that of our own Sun.’
    • ‘It was suggested that the red supergiant orbited a companion star that had shredded its outer layers just before the explosion.’
    • ‘In fact, it has become the coolest supergiant star ever found and all because of a single observation made by a dedicated amateur astronomer in Australia.’
    • ‘This new heat supply causes the outer layers of the star to expand and cool, and the star becomes a red giant, or a red supergiant if it is very massive.’
    • ‘The discovery confirms the accepted theory that type II supernovas are produced when elderly, bloated stars known as red supergiants run out of nuclear fuel and collapse.’