Full record for ultrawave n.

Definition a wave phenomenon that propagates faster than the speed of light: a communication system using such a wave
OED requirements antedating 1939
Earliest cite Lester del Rey, 'Habit'
Comment Ralf Brown located, and Douglas Winston and Lawrence Watt-Evans independently submitted, a cite from a reprint of Robert Silverberg's "Tower of Glass"; Mike Christie verified the cite in the 1970 first magazine appearance.
Douglas Winston submitted a cite from a 1976 reprint of Leigh Brackett's 1951 "The Starmen of Llyrdis"; Mike Christie verified it in the original magazine appearance.
Ralf Brown located a cite in an electronic text of Alan Dean Foster's 1973 "Bloodhype", and David Dyer-Bennet verified it in a paper copy.
Ralf Brown suggested "Beep", by James Blish: Mike Christie submitted a cite from its 1954 first publication.
From an online etext, Dan Tilque suggested E.E. Doc Smith's "Triplanetary": we would be like to see cites from the first print publication (Amazing Stories 1934, probably the January issue)
Last modified 30 July, 2019

Citations for ultrawave n.

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1939 L. del Rey Habit in L. del Rey Early del Rey (1975) 64 The radio signals came through on the ultrawave every so often, but the pep-talk description of the thrilling contest for endurance racing didn't mean much when I put it up against the facts.
1951 I. Asimov Foundation Trilogy–Foundation ii. i. 40 The news that the Terminus City ultrawave set received two hours ago.
1951 I. Asimov Foundation Trilogy–Foundation iii. vi. 122 Use the ultrawave sets there to contact other portions of the planet.
1951 L. Brackett Starmen of Llyrdis in Startling Stories Mar. 60/1 Kerrel's face appeared on the small screen. There was no need now for the ultra-wave and the ordinary visiphone unit had been cut in.
1954 J. Blish Beep in Galaxy Sci. Fiction Feb. 15/1 If I were to send orders by ultrawave to my Three Ghosts agent, he'd have to wait three hundred and twenty-four years to get them.
1970 R. Silverberg Tower of Glass in Galaxy Mag. Apr. 57/1 To the east is the laboratory where the tachyon-beam ultrawave communications equipment is being fabricated–a small pink dome which usually contains ten or a dozen technicians, patiently assembling the devices with which Krug hopes to send messages to the stars.
1973 A. D. Foster Bloodhype 29 That, coupled with what he would make off the Largess expedition, ought to provide enough to refinish the entire screen. Plus getting an ultrawave booster for Ben, the Umbra's comm operator.
1992 V. Vinge Fire upon Deep i. xiv. 93 Jefri thinks it may be possible to use the ship's ultrawave to call for help from others like his parents.