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Radiometry
- The use of the radiometer, or the measurement of radiation.
Radiophare
- A radiotelegraphic station serving solely for determining the position of ships. The radius of operation of such stations was restricted by the International Radiotelegraphic Convention (1912) to 30 nautical miles.
Radiophony
- The art or practice of using the radiophone.
Radiotelegram
- A message transmitted by radiotelegraph.
Radiotelegraphic
- Of or pertaining to radiotelegraphy; employing, or used or employed in, radiotelegraphy.
Radious
- Consisting of rays, as light.
Radula
- The chitinous ribbon bearing the teeth of mollusks; -- called also lingual ribbon, and tongue. See Odontophore.
Raduliform
- Rasplike; as, raduliform teeth.
Raff
- To sweep, snatch, draw, or huddle together; to take by a promiscuous sweep.