Tank n. : A small Indian dry measure, averaging 240 grains in weight; also, a Bombay weight of 72 grains, for pearls.

Tank n. : A large basin or cistern; an artificial receptacle for liquids.

Example:
What is the smallest saltwater Tank I can set up?

Taxonomy
tank, gun, armour, World War II, vehicles, protection, mobility, tank design, firepower, Soviet, infantry, tank gun, crew, battlefield, the Cold War, History, weapon, design.

Defination from the web:
tank and Tanks in World War I. Video clip of tanks in Langres, France, during the First World War(1918) ... The order was coded as "special tanks", and ironically much of the work was undertaken in the NBL Tank shops and the name stuck[8] ...