[yoor-ee-eys, -eyz]
noun Biochemistry.
an enzyme that changes urea into ammonium carbonate, occurring in bacteria, fungi, etc.

1895–1900; ure(a) + -ase

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World English Dictionary
urease (ˈjʊərɪˌeɪs, -ˌeɪz)
an enzyme occurring in many plants, esp fungi, that converts urea to ammonium carbonate

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

urease u·re·ase (yur'ē-ās', -āz') or u·rase (yur'ās', -āz')
An enzyme that cataylzes the hydrolysis of urea to form ammonium carbonate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


an enzyme that catalyzes the hydrolysis of urea, forming ammonia and carbon dioxide. Found in large quantities in jack beans, soybeans, and other plant seeds, it also occurs in some animal tissues and intestinal microorganisms. Urease is significant in the history of enzymology as the first enzyme to be purified and crystallized (by James B. Sumner in 1926). This achievement laid the groundwork for the subsequent demonstration that urease and other enzymes are proteins.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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