Astronomy, supergiant star.
an extremely large or powerful person, company, thing, etc.
extremely large; immense.

1925–30; super- + giant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
supergiant (ˈsuːpəˌdʒaɪənt)
giant star Compare white dwarf any of a class of extremely large and luminous stars, such as Betelgeuse, which have expanded to a large diameter and are eventually likely to explode as supernovae

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
supergiant   (s'pər-jī'ənt)  Pronunciation Key 
A star that is larger, brighter, and more massive than a giant star, being thousands of times brighter than the Sun and having a relatively short lifespan—only about 10 to 50 million years as opposed to around 5 billion years for the Sun. Supergiants, such as Betelgeuse and Rigel in Orion, are only found in young cosmic structures such as the arms of spiral galaxies. Red supergiants such as Betelgeuse are late-stage stars, having burned most of their hydrogen in an earlier stage as main-sequence stars, and now fuse helium into heavier elements through the triple alpha process. Blue supergiants such as Rigel are thought to have evolved from red giants, though some are considered main-sequence stars. Supergiants are thought to eventually undergo a supernova, ending up as neutron stars or black holes.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In this case, it was apparently in a bloated form known as a red supergiant.
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