Full record for porthole n.

Definition a porthole in a spacecraft or aircraft
OED requirements antedating 1925
Earliest cite W. Elwyn Backus 'The Waning of a World'
Comment Jeff Prucher submitted a 1931 cite from Gawain Edwards "The Return to Jupiter". Alistair Durie submitted a 1925 cite from W Elwyn Backus's "The waning of a world".

Earliest cite in the OED: 1956.

Last modified 6 July, 2008

Citations for porthole n.

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1925 W. E. Backus Waning of World in Weird Tales Dec. 828/2 ‘Boys, I'm going to try a whiff of our new atmosphere’, said the professor, unlatching one of the small portholes. Before either of the others could interfere, he had swung the heavy glass slightly inward, and sniffed the Martian air speculatively.
1931 ‘G. Edwards’ Return from Jupiter in Wonder Stories Mar. 1062/2 On either side was a row of round portholes through which the occupants could look out into space.
1931 ‘G. Edwards’ Return from Jupiter in Wonder Stories Mar. 1062/2 It was a space-car, long, swift, gleaming in the pale light of the distant sun like a cartridge of stainless steel. On either side was a row of round portholes through which the occupants could look out into space.