Wordnet polsko-angielski 
                         (any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active) 
proenzyme, zymogen 
synonim: zymogen
Słownik medyczny polsko-angielski Iwona Kienzler
                        proenzyme n, zymogen n
Wielki słownik medyczny polsko-angielski 2011 r., Anna Słomczewska
                        proenzyme
Słownik środowiska polsko-angielski 
                        m proferment, proenzyme