/hum"ing berrd'/ , n.
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, Amer.; HUMMING + BIRD ]