Wiktionary
n. (context star English) A star that has stopped fuse hydrogen in its core and as a result has grown much larger and brighter.
WordNet
n. a very bright star of large diameter and low density (relative to the Sun) [syn: giant]
Wikipedia
A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature. They lie above the main sequence (luminosity class V in the Yerkes spectral classification) on the Hertzsprung–Russell diagram and correspond to luminosity classes II and III. The terms giant and dwarf were coined for stars of quite different luminosity despite similar temperature or spectral type by Ejnar Hertzsprung about 1905.
Giant stars have radii up to a few hundred times the Sun and luminosities between 10 and a few thousand times that of the Sun. Stars still more luminous than giants are referred to as supergiants and hypergiants.
A hot, luminous main-sequence star may also be referred to as a giant, but any main-sequence star is properly called a dwarf no matter how large and luminous it is.
Usage examples of "giant star".
A supernova watch by the Republic of the red super giant star Carconth, nearest stellar body to deep - space anomaly 1033, (second largest and seventh brightest star in the galaxy) begins.
Supreme Warlord Harrsk had established his stronghold on a rocky planet that orbited close to a red giant star.
Hundreds of Rebel commanders, of all species and lifeforms, assembled in the war room of the giant Star Cruiser, awaiting orders from the High Command.
Luke saw the giant Star Destroyer's powerful beam strobe, saw it pierce the skyhook.
On the viewscreen before him was Havarrnus, a black, shriveled world blasted by the light of a red giant star.
But this-he indicated the giant star map and the intricate controls on the table-will have to be studied before we can push the right levers.
At the last instant, it appeared so filled with brilliant-patterned color that they seemed to be plunging headlong into a giant star.
Half the crew was lost in the terrifying hours trapped within a gas giant star, and both Falcã.