[n] a cell for violent prisoners
[n] a large (usually metallic) vessel for holding gases or liquids
[n] an enclosed armored military vehicle; has a cannon and moves on caterpillar treads
[n] a freight car that transports liquids or gases in bulk
[n] as much as a tank will hold
[v] treat in a tank; "tank animal refuse"
[v] store in a tank by causing (something) to flow into it