astro-

The definition of astro as a prefix means relating to things that are beyond Earth’s atmosphere.

(prefix)

A science that studies the physical properties of celestial bodies is an example of astrophysics.

See astro- in Webster's New World College Dictionary

Origin: < Gr astron, star

See astro- in American Heritage Dictionary 4

or astr-

prefix

a. Star: astrophysics.
b. Celestial body: astrometry.
c. Outer space: astronaut.
The aster of a cell: astrosphere.

Origin:

Origin: Greek

Origin: , from astron, star; see ster-³ in Indo-European roots

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