a radio receiver with a directional antenna for determining the bearing of the receiver from a radio transmitter.
any navigational device that gives a bearing by determining the direction of incoming radio waves transmitted from a particular radio station or beacon See also goniometer (sense 2)
radiocurable ra·di·o·cur·a·ble (rā’dē-ō-kyur’ə-bəl) adj. Curable by irradiation.
radiodense ra·di·o·dense (rā’dē-ō-děns’) adj. Radiopaque.
noun 1. a navigational aid establishing a fix by means of the bearings of two known radio stations. Abbreviation: RDF.
[rey-dee-oh] /ˈreɪ diˌoʊ/ noun, plural radios. 1. wireless telegraphy or telephony: speeches broadcast by radio. 2. an apparatus for receiving or transmitting radio broadcasts. 3. a message transmitted by radio. adjective 4. pertaining to, used in, or sent by radio. 5. pertaining to or employing radiations, as of electrical energy. verb (used with object), radioed, […]