- noun a platoon-sized armoured grouping of three or more tanks
- noun a platoon-sized artillery grouping of two or more guns
- noun a platoon-sized grouping in certain supporting arms, such as engineers
- noun a company-sized armoured cavalry grouping of three or more platoons
Origin & History of “troop”
Troop was borrowed from French troupe (acquired again as troupe in the 19th century). this appears to have been a back-formation from troupeau ‘flock, herd’, a diminutive formation based on Latin troppus. And troppus itself may have been of Germanic origin. By the time the word reached English it was already being applied to a ‘group of soldiers’, and its plural was being used as a collective term for ‘soldiers’.