a very small nectar-sipping New World bird of the family Trochilidae, characterized by the brilliant, iridescent plumage of the male, a slender bill, and narrow wings, the extremely rapid beating of which produces a humming sound: noted for their ability to hover and to fly upward, downward, and backward in a horizontal position.

1625–35, Americanism; humming + bird Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hummingbird (ˈhʌmɪŋˌbɜːd)
any very small American bird of the family Trochilidae, having a brilliant iridescent plumage, long slender bill, and wings specialized for very powerful vibrating flight: order Apodiformes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
There's a good reason for this: it helps deposit pollen specifically on the
  underchin of the flower's hummingbird pollinators.
We get bats on our hummingbird feeder in the late summer early fall.
He came with the cool breeze of late night or on days so hot that even the
  hummingbird stayed still in the shade.
Let's talk about the hummingbird, which a lot of people think is kind of a
  unicorn on wings, all sweetness and light.
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