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

 

thinner

 noun
noun
BrE BrE//ˈθɪnə(r)//
 
; NAmE NAmE//ˈθɪnər//
 
[uncountable, countable]
 
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a substance that is added to paint, varnish, etc. to make it less thick
See the Oxford Advanced American Dictionary entry: thinner