army ant

noun

any of the chiefly tropical ants of the suborder Dorylinae that travel in vast swarms, preying mainly on other insects.

Also called driver ant, legionary ant.

Origin

1870-75

Examples from the web for army ant

That's the scale of army ant operations when they're attacking a tarantula or scorpion.

British Dictionary definitions for army ant

army ant

noun

any of various mainly tropical American predatory ants of the subfamily Dorylinae, which live in temporary nests and travel in vast hordes preying on other animals Also called legionary ant See also driver ant