[av-i-din, uh-vid-in]

noun Biochemistry.

a protein, found in the white of egg, that combines with and prevents the action of biotin, thus injuring the animal that consumes it in excess by producing biotin deficiency.

Nearby words

  1. avicebrón,
  2. avicenna,
  3. avicularium,
  4. aviculture,
  5. avid,
  6. avidity,
  7. avidly,
  8. avidya,
  9. aviemore,
  10. avifauna

Origin of avidin

1940–45; avid + (biot)in; so named from its affinity for biotin

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for avidin



a protein, found in egg-white, that combines with biotin to form a stable compound that cannot be absorbed, leading to a biotin deficiency in the consumer

Word Origin for avidin

C20: from avid + (bio) in; from its characteristic avidity for biotin

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for avidin




A protein, found in uncooked egg white, that binds to and inactivates biotin and which, when present in abundance, can result in a deficiency of biotin.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.