Wiktionary
n. (context star English) A very large, red star, such as Betelgeuse and Antares.
Wikipedia
Red supergiants (RSGs) are supergiant stars ( luminosity class I) of spectral type K or M. They are the largest stars in the universe in terms of volume, although they are not the most massive. Betelgeuse and Antares are the brightest and best known red supergiants, indeed the only first magnitude red supergiants.
Usage examples of "red supergiant".
Its only tramline reaches to a star only a third of a light-year away~-Murcheson's Eye, the red supergiant-and ends deep inside the red-hot outer envelope.
They called the twin stars Murcheson's Eye, and believed that the red supergiant had no special name.
Murcheson's Eye is a red supergiant, a big, empty star, as big as the orbit of Saturn in Sol System.
A thick interstellar mass, and a red supergiant right at the edge for illumination!
Murcheson's Eye, the red supergiant, had a yellow fleck in it: the MOte.
The center of the formation was the red supergiant, the Hub, the Helleye, Fat Satan-it had a dozen names.
Murcheson's Eye, the red supergiant, had a yellow fleck in it: the Mote.
Straight overhead was a big blue giant that looked like a flashing jewel and a little to one side was a dull coal of a star, a red supergiant, perhaps.