The Collaborative International Dictionary of English v.0.48:
Humming \Hum"ming\, n. A sound like that made by bees; a low, murmuring sound; a hum. [1913 Webster] Hummingale, lively or strong ale. --Dryden. Humming-bird moth (Zool.), a hawk moth. See Hawk moth, under Hawk, the bird. [1913 Webster] hummingbird