Pronunciation: (fôl'kun, fal'-, fô'kun),[key] —n. 1. any of several birds of prey of the family Falconidae, esp. of the genus Falco, usually distinguished by long, pointed wings, a hooked beak with a toothlike notch on each side of the upper bill, and swift, agile flight, typically diving to seize prey: some falcon species are close to extinction.
2. Falconry. a. the female gyrfalcon.
c. any bird of prey trained for use in falconry. Cf. tercel. 3. a small, light cannon in use from the 15th to the 17th century.
4. (cap.) Mil.a family of air-to-air guided missiles, some of them capable of carrying nuclear warheads.