Full record for sub-ether n.

Definition the medium through which faster-than-light signals propagate
OED requirements antedating 1930
Earliest cite Edward E. Smith, 'Skylark Three'
Comment Suggested by Mike Christie.
Fred Galvin submitted a 1947 cite from Jerry Shelton's "You Are Forbidden!".
Fred Galvin submitted a 1934 cite from E. E. Smith's "The Skylark of Valeron".
Fred Galvin submitted a 1936 cite from Eando Binder's "Static".
Fred Galvin submitted a 1953 cite from Arthur Porges's "The Liberator".
Fred Galvin submitted a 1930 cite from Edward E. Smith's "Skylark Three".
Last modified 30 July, 2019

Citations for sub-ether n.

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1930 Amazing Stories Sept. 562/2 Therefore, if there is anything between the particles of the ether–thismatter is being debated hotly among us at the present time–it must be asub-ether, if I may use that term.
1934 Astounding Stories Sept. 32/1 He knew that the zones of force surrounding his vessel were absolutely impenetrable to any wave propagated through the ether, and to any possible form of material substance. He knew also that the subether was blocked, through the fifth and sixth orders. He knew that it was hopeless to attempt to solve the problem of the seventh order in the time at his disposal.
1936 ‘E. Binder’ Static in Thrilling Wonder Stories Dec. 40/1 ‘It is easy enough,’ he began as the spy listened, ‘to transmit through the ether forms of high frequency energy, but the power loss is tremendous. My approach to the problem was to discover a new medium of transmission–the sub-ether, which–’
1944 Astounding Sci.-Fiction Feb. 67/2 Giant battleships of space would be entering sub-ether tubes for faster-than-light journeying to the scene of emergency.
1946 Astounding Sci.-Fiction Mar. 156/1 They had traced the tiny ripples that He had left in the subether–their swift strides overhauled His weakening progress with terrible inexorability.
1953 A. Porges Liberator in Mag. Fantasy & Sci. Fiction Dec. 121 They had every band under strict surveillance, from cosmic rays to sub-ether.