Dictionary.com
Thesaurus.com

zymogen

American  
[zahy-muh-juhn, -jen] / ˈzaɪ mə dʒən, -ˌdʒɛn /

noun

Biochemistry.
  1. any of various enzyme precursor molecules that may change into an enzyme as a result of catalytic change.


zymogen British  
/ ˈzaɪməʊˌdʒɛn /

noun

  1. biochem any of a group of compounds that are inactive precursors of enzymes and are activated by a kinase

"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

Etymology

Origin of zymogen

< German (1875); zymo-, -gen

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

At Jessup, Woods had begun reading Merriam-Webster’s Collegiate Encyclopedia, a four-pound tome that starts with an entry on the German city of Aachen and ends with zymogen, a protein precursor to enzymes.

From The New Yorker

When in this stage, the compound is known as "proenzyme," or "zymogen."

From Project Gutenberg