By comparison, the other principal nuclear weapons materials, plutonium and uranium, decay over thousands of years.

Devilance's principal weapon is his lance, which serves many functions.

They thought he was foolish to throw away his principal weapon.

But their principal weapon is the spear which resembles a long lance.

Small arms, automatic weapons, and hand grenades were the principal weapons.

This suggests another limitation on the Fed's power: its principal weapon is rather blunt.

For his principal weapon, however, he still carried his father's axe.

In this phase, his principal weapon would be his own composure.

Even so, the gun remained the principal naval weapon.

As any parent knows, "It's not fair", is one of the principal rhetorical weapons used by children from almost the moment they can speak.