Telemetry by use of radio waves.

Synonym of teletype, a telegraph that automatically prints transmited messages in letters rather than Morse code or other symbols.

(astronomy) An instrument that detects X-rays originating from outside the Earth's atmosphere.

A telegraph post

A telephone number for which an extra charge is assessed to the caller, part of which is returned to the owner of the number.

plural of premium-rate telephone number

(astronomy) A telescope designed to make observations of the sun.

(astronomy) A type of reflecting telescope employing a parabolic liquid mirror made by spinning a pool of reflective liquid.

plural of telephone number

(photography) Photography of distant subjects using a telephoto lens. / (dated) The transmission of images over a distance, especially by facsimile.