giant star

noun

a star having a diameter of from 10 to 100 times that of the sun, as Arcturus or Aldebaran.
Also giant.
Compare supergiant star.

Origin of giant star

First recorded in 1910–15

Words nearby giant star

giant sequoia, giant silkworm moth, giant slalom, giant snail, giant squid, giant star, giant steps, giant sunflower, giant tortoise, giant urticaria, giant water bug

British Dictionary definitions for giant star

giant star

noun

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

Scientific definitions for giant star

giant star

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.