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

hummingbird

noun
 
/ˈhʌmɪŋbɜːd/
 
/ˈhʌmɪŋbɜːrd/
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  1. a small brightly coloured 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 humming sound)Topics Birdsc2
    Word Originmid 17th cent.: so named because of the humming sound produced by the rapid vibration of the bird's wings.
See hummingbird in the Oxford Advanced American Dictionary
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