red giant

noun Astronomy.
a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue.

Origin:
1915–20

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Collins
World English Dictionary
red giant
 
n
a giant star towards the end of its life, with a relatively low temperature of 2000--4000 K, that emits red light

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
red giant  
A giant star that has a relatively low surface temperature, giving it a reddish or orange hue. Red giants are non-main-sequence stars positioned in the upper right of the Hertzsprung-Russell diagram. They are not massive stars but rather late, expanded stages of lower-mass main-sequence stars that have exhausted the hydrogen in their core and are fusing their remaining hydrogen into helium in a luminous outer shell. The Sun is expected to become a red giant in about 5 billion years, expanding to 70 times its current size and bringing its surface extremely close to Earth's present orbit. See more at star. See Note at dwarf star.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They expected to see hot gas funneling from a cool red giant star into a hot,
  dense blue star.
It then inflates to many times its normal size, becoming an enormous red giant.
About the sun entering the red giant star cycle or another asteroid coming and
  hitting our planet cant be controlled by us.
One day the sun will distend into a red giant before it shrinks into a white
  dwarf.
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