any of several omnivorous ants, as the migrant Solenopsis geminata originating in tropical and subtropical South America, having a sting that produces a burning sensation.
Origin
1790-1800
Examples from the web for fire ant
Contact insecticides are frequently used in the red imported fire ant management.
British Dictionary definitions for fire ant
fire ant
noun
1.
any mound-building predatory ant of the genus Solenopsis, of tropical and subtropical America, that can inflict a painful sting