hummingbird definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of a large family (Trochilidae, order Apodiformes) of very small, brightly colored, New World birds with a long, slender bill for feeding on nectar, and narrow wings that vibrate rapidly, often with a humming sound
hummingbird definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of numerous New World birds of the family Trochilidae, usually very small in size and having brilliant iridescent plumage, a long slender bill, and wings capable of beating very rapidly, thereby enabling the bird to hover.