Webster's Revised Unabridged Dictionary · 1913

Whirlwind

Whirlwind , noun

[Compare Icelandic hvirfilvindr, Swedish hvirfvelvind, Danish hvirvelvind, German wirbelwind. See Whirl, and Wind, n.]

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.
The swift dark whirlwind that uproots the woods. And drowns the villages. — Bryant

Some meteorologists apply the word whirlwind to the larger rotary storm also, such as cyclones.

2.
Figuratively: A body of objects sweeping violently onward.
The whirlwind of hounds and hunters. — Macaulay