Full record for impervium n.

Definition a near-indestructible synthetic material or alloy
OED requirements antedating 1942
Earliest cite F. Orlin Tremaine, "A Leader for Korcin"
Comment Suggested by Malcolm Farmer.
Fred Galvin submitted a cite from a 1953 reprint of Hugh Frazier Parker's 1943 "The Sword of Johnny Damokles".
Fred Galvin submitted a cite from a 1952 reprint of "Lawrence O'Donnell's" (pseud. of Kuttner & Moore) 1943 "Clash By Night"; Mike Christie verified the cite in the 1943 first appearance.
Fred Galvin submitted a 1949 cite from "Rene LaFayette's" "The Emperor of the Universe".
Fred Galvin submitted a cite from a 1959 reprint of Leigh Brackett's 1944 "Terror Out of Space".
Fred Galvin submitted a 1962 cite from Jeff Sutton's "After Ixmal".
Fred Galvin submitted a 1946 cite from Thornecliffe Herrick's "Coffin Cargo".
Fred Galvin submitted a 1949 cite from Ross Gallun's "Mysta of the Moon".
Fred Galvin submitted a 1942 cite from "A Leader for Korcin" by F. Orlin Tremaine

(Impervium is now a trademarked name for a type of stainless steel)

Last modified 10 December, 2009

Citations for impervium n.

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1943 ‘L. O'Donnell’ Clash By Night in Astounding Sci.-Fiction Mar. 9/1 A half mile beneath the shallow Venusian sea the black impervium dome that protects Montana Keep rests frowningly on the bottom.
1946 ‘T. Herrick’ Coffin Cargo in Planet Comics Nov. 33/2 Someone or something was outside for through the thick impervium of the hull there came a muffled beating.
1949 R. Gallun Mysta Of Moon in Planet Comics Jan. 43 But don't worry, the impervium plates on the ship will protect us!
1949 ‘R. Lafayette’ Emperor of Universe in Startling Stories Nov. 139/2 We had no air, we had no water, we had no food and our drives—antique directors which had gone out with Lorrilard—had burned themselves into a dainty crisp of curled impervium.
1959 L. Brackett in D. A. Wollheim Hidden Planet i. 156 Farrell went on screaming. His throat seemed to be lined with impervium.