Webster's English Dictionary

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tank

1. tank \'tank\ n [Pg tanque, alter. of estanque, fr. estancar to stanch, 
   fr. (]assumed) VL stanticare - more at STANCH dial  1: POND, POOL; esp : 
   one built as a water supply  2: a usu. large receptacle for holding, 
   transporting, or storing liquids  3: an enclosed heavily armed and armored 
   combat vehicle supported, driven,  and steered by caterpillar treads 4: a 
   prison cell or enclosure used esp. for receiving prisoners 
2. tank vt : to place, store, or treat in a tank