'Whirlwind' definitions:

Definition of 'whirlwind'

From: WordNet
noun
A more or less vertical column of air whirling around itself as it moves over the surface of the Earth

Definition of 'Whirlwind'

From: GCIDE
  • Whirlwind \Whirl"wind`\, n. [Cf. Icel. hvirfilvindr, Sw. hvirfvelvind, Dan. hvirvelvind, G. wirbelwind. See Whirl, and Wind, n.] [1913 Webster]
  • 1. A violent windstorm of limited extent, as the tornado, characterized by an inward spiral motion of the air with an upward current in the center; a vortex of air. It usually has a rapid progressive motion. [1913 Webster]
  • The swift dark whirlwind that uproots the woods. And drowns the villages. --Bryant. [1913 Webster]
  • Note: Some meteorologists apply the word whirlwind to the larger rotary storm also, such as cyclones. [1913 Webster]
  • 2. Fig.: A body of objects sweeping violently onward. "The whirlwind of hounds and hunters." --Macaulay. [1913 Webster]