| asparaginase | (noun) antineoplastic drug (trade name Elspar) sometimes used to treat lymphoblastic leukemia | Synonyms: Elspar |
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| collagenase | (noun) any enzyme that catalyzes the hydrolysis of collagen and gelatin | - |
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| cyclooxygenase | (noun) either of two related enzymes that control the production of prostaglandins and are blocked by aspirin | Synonyms: Cox |
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| enterokinase | (noun) enzyme in the intestinal juice that converts inactive trypsinogen into active trypsin | - |
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| fibrinase | (noun) in the clotting of blood thrombin catalyzes factor XIII into its active form (fibrinase) which causes fibrin to form a stable clot | Synonyms: factor XIII |
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| histaminase | (noun) enzyme that acts as a catalyst in converting histidine to histamine | - |
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| kinase | (noun) an enzyme that catalyzes the conversion of a proenzyme to an active enzyme | - |
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| nitrogenase | (noun) an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia | - |
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| oxygenase | (noun) an oxidoreductase that catalyzes the incorporation of molecular oxygen | - |
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| penicillinase | (noun) enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic | Synonyms: beta-lactamase |
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| proteinase | (noun) any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis | Synonyms: peptidase, protease, proteolytic enzyme |
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| prothrombinase | (noun) coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors | Synonyms: factor X |
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| pyocyanase | (noun) a yellow-green mixture of antibiotics obtained from the bacillus of green pus | - |
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| ribonucleinase | (noun) a transferase that catalyzes the hydrolysis of ribonucleic acid | Synonyms: ribonuclease, RNase |
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| streptodornase | (noun) an enzyme produced by some hemolytic strains of streptococcus that dissolves fibrinous secretions from infections; used medicinally (often in combination with streptokinase) | - |
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| streptokinase | (noun) an enzyme produced by some strains of streptococcus that can liquefy blood clots by converting plasminogen to plasmin; used medicinally in some cases of myocardial infarction and pulmonary embolism | - |
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| thrombokinase | (noun) an enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot | Synonyms: factor III, thromboplastin |
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| transaminase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminopherase, aminotransferase |
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| urokinase | (noun) protease produced in the kidney that converts plasminogen to plasmin and so initiates fibrinolysis | Synonyms: plasminogen activator |
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