[tel-uh-ran] 
) | a navigational aid that uses radar to map the sky above an airfield, which, together with a map of the airfield itself, is transmitted by television to aircraft approaching the field. |
| tel·e·ran (těl'ə-rān') n. An air-traffic control system in which the image of a ground-based radar unit is televised to aircraft in the vicinity so that pilots may see their positions in relation to other aircraft. [Originally a trademark.] |