army tank ar·my·tank uncommon noun 1. an enclosed armored military vehicle; has a cannon and moves on caterpillar treads Synonymstankarmy tankarmored combat vehiclearmoured combat vehicle Related words Broader terms military vehiclearmored vehicletracked vehicle Narrower terms panzer Part of cannongun enclosure WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.