any of several large, hairy social bees of the family Apidae.
Also, bumble bee.

1520–30; bumble2 + bee1

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World English Dictionary
bumblebee or humblebee (ˈbʌmbəlˌbiː)
any large hairy social bee of the genus Bombus and related genera, of temperate regions: family Apidae
[C16: from bumble² + bee1]
humblebee or humblebee
[C16: from bumble² + bee1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1520s, replacing M.E. humbul-be, alt. by assoc. with M.E. bombeln "to boom, buzz," echoic, from PIE base *kem "to hum," echoic.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The presenter, in a bright red sweatshirt, is demonstrating how to construct a
  cardboard cut-out bumblebee.
But big as a bumblebee skimming flowers in the garden.
Her owners expect that she will be able to forage for food, as she recently
  captured and ate a bumblebee for a snack.
When they let the bumblebee foragers loose on the array, the insects showed a
  preference for visiting the blue flowers.
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