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

 

topsoil

 noun
noun
BrE BrE//ˈtɒpsɔɪl//
 
; NAmE NAmE//ˈtɑːpsɔɪl//
 
[uncountable] Growing crops
 
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the layer of soil nearest the surface of the ground compare subsoil See related entries: Growing crops
See the Oxford Advanced American Dictionary entry: topsoil