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a. Star: astrophysics.
b. Celestial body: astrometry.
c. Outer space: astronaut.
2. The aster of a cell: astrosphere.
1. indicating a heavenly body, star, or star-shaped structure: astrology; astrocyte.
2. indicating outer space: astronautics.
[from Greek, from astron star]
a combining form with the meaning “pertaining to stars or celestial bodies, or to activities, as spaceflight, taking place outside the earth's atmosphere”: astronautics; astrophotography.
[< Greek, comb. form of ástron a star, constellation, akin to astḗr star]
A prefix that means "star" (as in astrophysics), "celestial body" (as in astronomy), or "outer space" (as in astronaut).
pref → Astro-