Real Dictionary

guided missile
countable noun: A guided missile is a missile whose direction can be controlled while it is in the air.
noun: a missile, esp one that is rocket-propelled, having a flight path controlled during flight either by radio signals or by internal preset or self-actuating homing devices

guided missile in American English
a military missile guided during flight to a target by internal preset, or self-reacting, devices or external electronic signals
noun: an aerial missile, as a rocket, steered during its flight by radio signals, clockwork controls, etc