An interdictor is a type of ground-attack aircraft that operates far behind enemy lines, with the express intent of interdicting the enemy's military targets, most notably those involved in logistics. The term has generally fallen from use. The strike fighter is a closely related concept, but puts more emphasis on air-to-air combat capabilities (fighter part).
The "classic" interdictor is the F-111, an aircraft able to operate at long distances from its base. The Panavia Tornado was built to a similar need, although operating over shorter ranges in the European theatre. The Soviet Sukhoi Su-24 and the aborted British TSR-2 are similar interdictor designs.