Definition of hummingbird noun from the Oxford Advanced American Dictionary

 

hummingbird

 noun
noun
NAmE//ˈhʌmɪŋˌbərd//
 
 
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a small brightly colored bird that lives in warm countries and that can stay in one place in the air by beating its wings very fast, making a continuous low sound (= a hum ming sound)
See the Oxford Advanced Learner's Dictionary entry: hummingbird