astro
- A prefix derived from the Greek word 'astron', meaning 'star', used to form words related to stars, celestial bodies, or outer space. prefixThe astronaut trained for years before going to space.Astrophysics is the branch of astronomy concerned with the physical nature of stars and other celestial bodies.
- A colloquial abbreviation for 'astronomy' or 'astrology', often used informally to refer to subjects or interests related to these fields. nounI've always been fascinated by astro and the mysteries of the universe.She reads her astro charts every morning to see what the stars have in store for her.