Definition of tank noun from the Oxford Advanced American Dictionary

      

    tank

     noun
    noun
    NAmE//tæŋk//
     
     
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  1. 1a large container for holding liquid or gas a hot water tank a fuel tank a fish tank (= for keeping fish in) see also septic tank, think tank
  2. 2  (also tankful
    NAmE//tæŋkfʊl//
     
    )
    the contents of a tank or the amount it will hold We drove there and back on one tank of gas.
  3. 3 a military vehicle covered with strong metal and armed with guns. It can travel over very rough ground using wheels that move inside metal belts.
See the Oxford Advanced Learner's Dictionary entry: tank