The branch of astronomy which utilizes radio waves through the use of radio telescopes to study celestial bodies and occurrences.

A radar system capable of detecting, tracking and discriminating a large number of targets simultaneously

(mathematics, physics) A function which specifies the average density of atoms, molecules etc in three dimensions from a given point.

an eye surgery procedure to correct myopia (near-sightedness) using a series of incisions in the cornea, radiating from a central point (hence radial).

A person who operates a radio transceiver, especially when a title or position in a crew.

Telemetry by use of radio waves.

The process and techniques of sending telegrams using radio waves rather than wires.

Referring to the science of radiometry.

A weatherproof enclosure used to protect a radar antenna.

A message, like a telegram, transmitted by radio rather than wires.