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

 

undercoat

 noun
noun
BrE BrE//ˈʌndəkəʊt//
 
; NAmE NAmE//ˈʌndərkoʊt//
 
[countable, uncountable]
 
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a layer of paint under the final layer; the paint used for making this Apply the undercoat first. compare topcoat
See the Oxford Advanced American Dictionary entry: undercoat