from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An increase in the quantity of blood flow to a body part; engorgement.

from The Century Dictionary.

  • noun In pathology, an excessive accumulation of blood in any part of the body.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun excess of blood in a body part.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun increased blood in an organ or other body part


from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ὑπέρ (huper, "over") + αἷμα (haima, "blood").


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  • "Another distinguished pathologist noted that the brain showed 'marked hyperemia'—blood flooding the brain, probably because of an out-of-control inflammatory response—adding, 'the convolutions of the brain were flattened and the brain tissues were noticeably dry.'"

    —John M. Barry, The Great Influenza (NY: Penguin Books, 2004), 240

    February 16, 2009