from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A pathological condition resulting from a disease.
  • n. A secondary consequence or result.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A disease or condition which is caused by an earlier disease or problem.

from the GNU version of the Collaborative International Dictionary of English

  • n. An adherent, or a band or sect of adherents.
  • n. That which follows as the logical result of reasoning; inference; conclusion; suggestion.
  • n. A morbid phenomenon left as the result of a disease; a disease resulting from another.

from The Century Dictionary and Cyclopedia

  • n. That which follows; a following.
  • n. In pathology, the consequent of a disease; a morbid affection which follows another, as cardiac disease after acute rheumatism, etc.

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

  • n. any abnormality following or resulting from a disease or injury or treatment


Latin sequēla, sequel; see sequel.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin sequela, from sequi ("follow"). Compare sequence. (Wiktionary)



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  • "The overwhelming majority of victims, especially in the Western world, recovered quickly and fully. This was after all only influenza. But the virus sometimes caused one final complication, one final sequela. The influenza virus affected the brain and nervous system. All high fevers cause delirium, but this was something else."
    —John M. Barry, The Great Influenza (NY: Penguin Books, 2004), 378

    February 17, 2009