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

 

alder

 noun
noun
BrE BrE//ˈɔːldə(r)//
 
; NAmE NAmE//ˈɔːldər//
 
 
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a tree like a birch that grows in northern countries, usually in wet ground Word Origin Old English alor, aler, of Germanic origin; related to German Erle; forms spelled with d are recorded from the 14th cent.
See the Oxford Advanced American Dictionary entry: alder