What is a low monotonous noise, as of bees in flight, of a swiftly revolving top, of a wheel, or the like; a drone; a buzz. The shard-borne beetle with his drowsy hums. Shak called?

hum — A low monotonous noise, as of bees in flight, of a swiftly revolving top, of a wheel, or the like; a drone; a buzz. The shard-borne beetle with his drowsy hums. Shak. (Webster's 1913.)