Tank /(tăṉk)/

Tank

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

Tank

n.
  1. A large basin or cistern; an artificial receptacle for liquids.
  2. A pond, pool, or small lake, natural or artificial.
    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.
  3. 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. (Mil.)
  4. a jail cell for temporarily holding prisoners, as in a police station.

Phrases & Compounds

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
a small nematoid worm found in the water tanks of India, supposed by some to be the young of the Guinea worm.