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

 

narwhal

 noun
noun
BrE BrE//ˈnɑːwəl//
 
; NAmE NAmE//ˈnɑːrwɑːl//
 
 
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a small white whale from the Arctic region. The male narwhal has a long tusk (= outer tooth). Word Origin mid 17th cent.: from Dutch narwal, Danish narhval, based on Old Norse nár ‘corpse’, with reference to skin colour.
See the Oxford Advanced American Dictionary entry: narwhal