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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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!