• synonyms


  1. a small protein, present in all eukaryotic cells, that participates in the destruction of defective proteins and in the synthesis of new proteins.
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Origin of ubiquitin

First recorded in 1985–90; ubiquit(ous) + -in1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ubiquitin


  1. biochem a small polypeptide, found in most eukaryotic cells, that combines with other proteins to make them susceptible to degradation
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Derived Formsubiquitination, noun

Word Origin

C20: from ubiquitous + -in
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

ubiquitin in Medicine


  1. A polypeptide found in all eukaryotic cells, including plant cells, that participates in a variety of cellular functions including protein degradation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.