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Answer for the clue "The use of radio to send telegraphic messages (usually by Morse code) ", 15 letters:
radiotelegraphy

Alternative clues for the word radiotelegraphy

Word definitions for radiotelegraphy in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Radiotelegraphy \Ra`di*o*te*leg"ra*phy\ (r[=a]`d[i^]*[o^]*t[e^]*l[e^]g"r[.a]*f[y^]), n. [Radio- + telegraphy.] Telegraphy using the radiant energy of radio waves; wireless telegraphy; -- the term adopted for use by the Radiotelegraphic Convention of 1912. ...

WordNet Word definitions in WordNet
n. telegraphy that uses transmission by radio rather than by wire [syn: radiotelegraph , wireless telegraphy ] the use of radio to send telegraphic messages (usually by Morse code) [syn: radiotelegraph , wireless telegraph , wireless telegraphy ]

Wiktionary Word definitions in Wiktionary
n. The process and techniques of sending telegrams using radio waves rather than wires.