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

 

dredger

 noun
noun
BrE BrE//ˈdredʒə(r)//
 
; NAmE NAmE//ˈdredʒər//
 
Types of boats and ships, Rivers and lakes
 
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a boat or machine that is used to clear mud, etc. from the bottom of a river, or to make the river wider See related entries: Types of boats and ships, Rivers and lakes
See the Oxford Advanced American Dictionary entry: dredger