Tank \Tank\, n. 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 homa. --F. Remington.

The tanks are full and the grass is high. --Lawson.

Source: Webster's Revised Unabridged Dictionary (1913)
 

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

Source: Webster's Revised Unabridged Dictionary (1913)
 

Tank \Tank\, n. [Pg. tanque, L. stangum a pool; or perhaps of East Indian origin. Cf. Stank, n.]

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

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.

Source: Webster's Revised Unabridged Dictionary (1913)