Definition of subatomic adjective from the Oxford Advanced Learner's Dictionary

 

subatomic

 adjective
adjective
BrE BrE//ˌsʌbəˈtɒmɪk//
 
; NAmE NAmE//ˌsʌbəˈtɑːmɪk//
 
[usually before noun](physics)
 
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smaller than, or found in, an atom subatomic particles
See the Oxford Advanced American Dictionary entry: subatomic