Definitions

1. noun

A star in the later stages of its life cycle, more massive than a red giant but less massive than a white dwarf, that has exhausted its hydrogen fuel but not yet reached the white dwarf stage.

“The subgiant star is expected to go supernova in a few million years.”

2. adjective

Describing a star that is in the later stages of its life cycle, more massive than a red giant but less massive than a white dwarf, that has exhausted its hydrogen fuel but not yet reached the white dwarf stage.

“The subgiant galaxy is a fascinating example of the evolution of stars in the universe.”