Pronunciation: (här-pOOn'),[key] —n. 1. a barbed, spearlike missile attached to a rope, and thrown by hand or shot from a gun, used for killing and capturing whales and large fish.
2. (cap.) Mil.a jet-powered, radar-guided U.S. Navy cruise missile with a high explosive warhead designed for use against surface ships and launchable from a surface vessel, submerged submarine, or aircraft.
—v.t. to strike, catch, or kill with or as if with a harpoon.