Real Dictionary

hummingbird
countable noun: A hummingbird is a small brightly coloured bird found in America, especially Central and South America. It has a long thin beak and powerful narrow wings that can move very fast.

hummingbird in American English
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
noun: 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

hummingbird in British English
noun: 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