supertank

/S UW1 P ER0 T AE1 NG K/
noun
  1. 1

    A very large or powerful tank (military vehicle).

  2. 2

    Used other than figuratively or idiomatically: see super, tank.

  3. 3

    Ellipsis of superheavy tank. [(military) A tank that is notably beyond the standard of the class heavy tank in either size or weight relative to contemporary vehicles.]