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

 

billow

 noun
noun
BrE BrE//ˈbɪləʊ//
 
; NAmE NAmE//ˈbɪloʊ//
 
 
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[usually plural] a moving mass or cloud of smoke, steam, etc. like a wave A farmer was burning straw, the yellow billows of smoke spiralling lazily upward. Word Origin mid 16th cent.: from Old Norse bylgja.
See the Oxford Advanced American Dictionary entry: billow

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