astro-

a combining form with the meaning “pertaining to stars or celestial bodies, or to activities, as spaceflight, taking place outside the earth's atmosphere,” used in the formation of compound words: astronautics; astrophotography.
Compare cosmo-.


Origin:
< Greek, combining form of ástron a star, constellation, akin to astḗr star; cf. aster, -aster2

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World English Dictionary
astro-
 
combining form
1.  indicating a heavenly body, star, or star-shaped structure: astrology; astrocyte
2.  indicating outer space: astronautics
 
[from Greek, from astron star]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

astro-
from Gk. astro-, stem and comb. form of astron "star," related to aster "star" (see star). In ancient Gk., aster typically was "a star" and astron mostly in plural, "the stars." In sing. it mostly meant "Sirius" (the brightest star).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
astro-  
A prefix that means "star" (as in astrophysics), "celestial body" (as in astronomy), or "outer space" (as in astronaut).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
ASTRO
American Society for Therapeutic Radiology and Oncology
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Third, macro photography ranks up there with astro photography for difficulty in getting everything right.
We would call astro-horror a subset sci-fi horror proper, which has much wider parameters.
There's some non-astro bits, but it's quite smashing.
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