a star having a diameter of from 10 to 100 times that of the sun, as Arcturus or Aldebaran.
any of a class of stars, such as Capella and Arcturus, that have swelled and brightened considerably as they approach the end of their life, their energy supply having changed Sometimes shortened to giant Compare supergiant
A very large, bright non-main-sequence star that burns hydrogen at a much faster rate than a dwarf star. Giant stars are much more luminous and have shorter lifespans than the slower-burning dwarfs. The larger the giant, the shorter its lifespan; the largest stars, with solar mass of around 100, blaze at several hundred thousand times the energy of the Sun and will last only a few million years, a very brief time when compared with the Sun’s 10-billion-year lifespan. Giant stars usually end their lives as supernovae , but even before that event the immense ultraviolet radiation they produce has a dramatic impact on their stellar surroundings; the presence of a giant star in a star system prevents the formation of new protostars because the radiation from the giant star breaks apart any nearby nebulae.
noun, (used with a singular verb) 1. a children’s game in which a leader calls upon individual players to advance toward him or her in a given number and variety of steps, the object being for one person to tag the leader and for all of them to run back to the starting line without […]
noun 1. a composite plant, Helianthus giganteus, of eastern North America, growing nearly 12 feet (4 meters) high and having very large yellow flower heads.
noun 1. any of several large tortoises of the genus Geochelone, of the Galápagos Islands and islands near Madagascar: some are endangered. noun 1. any of various very large tortoises of the genus Testudo, of the Galápagos, Seychelles, and certain other islands, weighing up to 225 kilograms (495 lbs.)
- Giant urticaria
giant urticaria n. See angioneurotic edema.