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

 

osier

 noun
noun
BrE BrE//ˈəʊziə(r)//
 
; NAmE NAmE//ˈoʊʒər//
 
 
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a type of willow tree, with thin branches that bend easily and are used for making baskets Word Origin late Middle English: from Old French; compare with medieval Latin auseria ‘osier bed’.
See the Oxford Advanced American Dictionary entry: osier