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Definition of astrophysicist noun from the Oxford Advanced Learner's Dictionary

 

astrophysicist

 noun
noun
BrE BrE//ˌæstrəʊˈfɪzɪsɪst//
 
; NAmE NAmE//ˌæstroʊˈfɪzɪsɪst//
 
 
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a scientist who studies the physical and chemical structure of the stars, planets, etc.