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

  • n. The quality or condition of being deficient; incompleteness or inadequacy.
  • n. A lack or shortage, especially of something essential to health; an insufficiency: a nutritional deficiency.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Inadequacy or incompleteness.
  • n. An insufficiency, especially of something essential to health.

from the GNU version of the Collaborative International Dictionary of English

  • n. The state of being deficient; inadequacy; want; failure; imperfection; shortcoming; defect.

from The Century Dictionary and Cyclopedia

  • n. The state of being deficient; a lack or failing; a falling short; incompleteness, as of intelligence, attainments, or performance.
  • n. That in which a person or thing is deficient; an imperfection.
  • n. Lack of the necessary quantity, number, etc.; inadequacy; insufficiency: as, a deficiency of troops; a deficiency of blood.
  • n. Absence; loss.

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

  • n. lack of an adequate quantity or number
  • n. the state of needing something that is absent or unavailable


from Wiktionary, Creative Commons Attribution/Share-Alike License

deficit +‎ -ency


  • It has been demonstrated that a blood protein deficiency is the cause of this inherited illness.

    Hives, urticaria, angiodema, allergic reactions

  • Protein deficiency is common in children (43% of children five years of age or less) resulting not only in a high mortality rate but irreversible mental retardation and restricted body development in survivors.

    There's No Such Thing as a Free Lunch

  • The best vitamin E form for preventing or reversing this deficiency is the liquid form: tocopheryl polyethylene glycol 1000 succinate (TPGS), because the body absorbs it more readily.

    Vitamin Supplementation for Children With Alagille Syndrome

  • Although my asymmetric hearing deficiency is most likely a congenital problem — that was nevertheless almost undetectable until my early 20s — the doctor wants to do one more test to rule out a benign tumor.


  • Folic acid deficiency is a leading cause of spina bifida and other neural tube defects in newborns, and can be prevented by taking folic acid supplementation during pregnancy.

    Folic Acid Supplementation - Too Much of a Good Thing?

  • Quite likely the single biggest piece of good news about G6PD deficiency is that it is widely understood to confer protection against malaria, in particular the most deadly form of that disease.

    Randall Amster: The Most Common Disease You've Never Heard Of

  • Despite worldwide incidence and a disparate impact on African-American communities, this peer-reviewed article cogently observed that "newborn screening for G6PD deficiency is not performed routinely in the United States."

    Randall Amster: The Most Common Disease You've Never Heard Of

  • Alpha-1-antitrypsin deficiency: a hereditary disease that can cause hepatitis and liver failure.

    Who needs a liver transplant?

  • The five diseases studied by the CLiC team are: Alagille Syndrome (AGS), Alpha-1-antitrypsin deficiency (a-1AT), Bile acid synthesis and metabolism defects, Mitochondrial hepatopathies, and Progressive familial intrahepatic cholestasis (PFIC).

    Links and Resources for Alagille Syndrome

  • (This deficiency is not completely protective against drinking, however, particularly if there is social pressure and high exposure to alcohol, such as among college fraternity members.) * Some people with alcoholism may have an inherited dysfunction in the transmission of serotonin.

    Gladwell: cultural norms affect drinking! | Dr Vino's wine blog


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