: a protein that forms an active enzyme system by combination with a coenzyme and determines the specificity of this system for a substrate

Word History

Etymology

International Scientific Vocabulary

First Known Use

1936, in the meaning defined above

Time Traveler
The first known use of apoenzyme was in 1936

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Cite this Entry

“Apoenzyme.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/apoenzyme. Accessed 8 Jul. 2026.

Medical Definition

: a protein that forms an active enzyme system by combination with a coenzyme and determines the specificity of this system for a substrate
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