1. A large, old, luminous star; has a relatively low surface temperature and a diameter large relative to the sun
   - red giant

Derived forms: red giant stars

Type of: star

• at once
• at one time
• at peace
• at present
• at random
• at rest
• at sea
• at sixes and sevens
• at stake
• at that place
• at the best
• at the drop of a hat
• at the least
• at the most
• at the ready
• at the same time
• at the worst
• at times
• at variance
• at will
• at work
• at worst
• at-bat
• Atabrine
• Atacama Desert