1. A transmitter used in the jamming of radio or radar transmissions.
2. Radiation or re-radiation of electromagnetic waves so as to impair the usefulness of a specific segment of the radio spectrum that is being used by a military enemy for communication or radar.
3. To interfere with or to prevent the clear reception of (broadcast signals) by electronic methods.

1. A device hat transmits a signal with a white noise component (noise of equal intensity over a wide range of frequencies) in order to prevent the functioning of a radar system.
2. An electronic jammer (causing interference) that emits a radio-frequency carrier modulated with a white noise signal (noise of mixed frequency) usually derived from a gas tube; used against military enemy radar.