Definition of astro- combining form from the Oxford Advanced Learner's Dictionary

 

astro-

 combining form
combining form
BrE BrE//ˈæstrəʊ//
 
; NAmE NAmE//ˈæstroʊ//
 
 
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(in nouns, adjectives and adverbs) connected with the stars or outer space astronaut astrophysics Word Originfrom Greek astron ‘star’.
See the Oxford Advanced American Dictionary entry: astro-