Full record for nullgrav n.

OED requirements antedating 1956
Earliest cite Robert A. Heinlein, 'The Door into Summer'
Comment Fred Galvin submitted a 1956 cite from Robert A. Heinlein's "The Door into Summer".
Fred Galvin submitted a 1957 cite from John Victor Peterson's "The Gently Orbiting Blonde".
Last modified 5 October, 2009

Citations for nullgrav n.

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1956 R. A. Heinlein Door Into Summer in Mag. Fantasy & Sci. Fiction Nov. 26/2 Two things impressed me most, one big, one little. The big one was NullGrav, of course. Back in 1970 I had known about the Babson Institute gravitation research but I had not expected anything to come of it—and nothing had; the basic field theory on which NullGrav is based was developed at the University of Edinburgh.
1957 T. Sturgeon Pod in Barrier in Galaxy Sci. Fic. Sept. 13/1 We'd taken off with a null-grav tug and slipped into second-order matrix within six hours—all very fast and painless, thanks to the Luanae.
1991 M. Weiss King's Test iii.ii. 259 She might as well try to penetrate null-grav fused steel.