American Heritage Dictionary
Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
It shows what sort of man he was, to say that for more than ten years he spent only part of one in England, and was the rest of the time in an antipodean hemisphere or a hyperborean zone.— The Man Without a Country and Other Tales
After this exercise, he blew a hyperborean whistle, as if to blow his wrath away.— The Virginians
It is alternately invaded by the hyperborean legions and by the wilting sirens of the tropics.— The Complete Project Gutenberg Writings of Charles Dudley Warner
But the Northland's hyperborean laugh was not yet ended.— Revolution, and Other Essays
I'm hyperborean as much as you.— Ulysses

Century Dictionary (1)
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