1. [noun] A vessel used to transport large quantities of liquid.
2. [noun] A tank truck (US) or fuel tanker, petrol tanker, road tanker (UK)
3. [noun] (military) Member of a tank crew, or of an armoured unit.
4. [noun] (surfing slang) A longboard.
5. [noun] A cargo ship designed to carry crude oil in bulk.
6. [noun] A soldier who drives a tank.