noun Biochemistry.
an enzyme, as pepsin, that functions outside the cell producing it.
Also called ectoenzyme.
Compare endoenzyme.

1920–25; exo- + enzyme

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World English Dictionary
exoenzyme (ˌɛksəʊˈɛnzaɪm)
1.  Compare endoenzyme any enzyme, esp an exopeptidase, that acts upon terminal chemical bonds in a chain of molecules
2.  another name for ectoenzyme

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Medical Dictionary

exoenzyme ex·o·en·zyme (ěk'sō-ěn'zīm')
See extracellular enzyme.

The American Heritage® Stedman's Medical Dictionary
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