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

 

spillway

 noun
noun
BrE BrE//ˈspɪlweɪ//
 
; NAmE NAmE//ˈspɪlweɪ//
 
(specialist)
 
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a passage for the extra water from a dam (= a wall across a river that holds water back)
See the Oxford Advanced American Dictionary entry: spillway