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Definition of astro- combining form from the Oxford Advanced American Dictionary

 

astro-

 combining form
combining form
NAmE//ˈæstroʊ//
 
, NAmE//ˈæstrə//
 
 
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(in nouns, adjectives, and adverbs) connected with the stars or outer space astronaut astrophysics
See astro- in the Oxford Advanced Learner's Dictionary
Check pronunciation: astro-

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