A hole that led tantalizingly upward from the roof of the city, only to end in a solid plug of fused rock.

Then have the power-machines cool it into a solid plug?

He could never leave the Mole while we pass through the solid plug.

Going over the mummy case when he was alone, he found a secret cavity in it closed by a solid plug of wood.

The original design was a simple solid plug filled with a slug of low-melting-point alloy.

Instead of drifting along the ceiling of the corridor, the smoke moves along as a solid plug.

It then is pushed out as a solid plug.

There they remove solid plugs of tissue to open access to major arteries and veins.

The situation aft was much worse than he had expected with an almost solid plug of wreckage barring their way.

Thus the vault was not a vault but rather a solid plug of molybdenum steel which extended into the wall for five feet.