Tank iron

Tank Tank (t[a^][ng]k), n. [Pg. tanque, L. stangum a pool; or perhaps of East Indian origin. Cf. {Stank}, n.] 1. A large basin or cistern; an artificial receptacle for liquids. [1913 Webster]

2. A pond, pool, or small lake, natural or artificial. [Webster 1913 Suppl.]

We stood in the afterglow on the bank of the tank and saw the ducks come home. --F. Remington.

The tanks are full and the grass is high. --Lawson. [Webster 1913 Suppl.]

3. (Mil.) a heavily armored combat vehicle which moves on caterpillar treads, rather than wheels. It typically carries a cannon and a heavy machine, and sometimes other weapons. It is the main distinguishing weapon of an armored division. [PJC]

4. a jail cell for temporarily holding prisoners, as in a police station. [PJC]

{Tank engine}, a locomotive which carries the water and fuel it requires, thus dispensing with a tender.

{Tank iron}, plate iron thinner than boiler plate, and thicker than sheet iron or stovepipe iron.

{Tank worm} (Zo["o]l.), a small nematoid worm found in the water tanks of India, supposed by some to be the young of the Guinea worm. [1913 Webster]