English

Definition of dark matter noun from the Oxford Advanced Learner's Dictionary

 

dark matter

 noun
noun
BrE BrE//ˌdɑːk ˈmætə(r)//
 
; NAmE NAmE//ˌdɑːrk ˈmætər//
 
[uncountable] (astronomy) Molecules and matter, The universe
 
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according to some theories, material that exists in space but does not reflect any light See related entries: Molecules and matter, The universe
See the Oxford Advanced American Dictionary entry: dark matter