Noun
The primary tank of a country or armed forces.
(military) A tank with a good balance of firepower, cross-country mobility, and armoured protection, and therefore capable of carrying out the roles of breakthrough, exploitation and infantry support.
Source: en.wiktionary.orgHe's found a teapot and milk and is brewing up, because that's what the English do when they've just broken out of military prison one jump ahead of murderous assassins from an alien death god cult, then survived being shot at by a main battle tank. Charles Stross
Interestingly, this included the T-80U Main Battle Tank. Source: Internet