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



BrE BrE//ˈhʌmɪŋbɜːd//
; NAmE NAmE//ˈhʌmɪŋbɜːrd//
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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) See related entries: Birds Word Originmid 17th cent.: so named because of the humming sound produced by the rapid vibration of the bird's wings.
See the Oxford Advanced American Dictionary entry: hummingbird