[ soo-per-jahy-uhnt ]

  1. Astronomy. supergiant star.

  2. an extremely large or powerful person, company, thing, etc.

  1. extremely large; immense.

Origin of supergiant

First recorded in 1925–30; super- + giant

Words Nearby supergiant Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use supergiant in a sentence

British Dictionary definitions for supergiant


/ (ˈsuːpəˌdʒaɪənt) /

  1. 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: Compare giant star, white dwarf

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for supergiant


[ sōōpər-jī′ənt ]

  1. 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.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.