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nu·cle·o·sid·ase | \ ˌn(y)ü-klē-ə-ˈsī-ˌdās, -ˌdāz 
\
\Medical Definition of nucleosidase
1 : an enzyme that promotes the hydrolysis of a nucleoside
2 : a phosphorylase that promotes reversibly the reaction of a nucleoside with phosphate forming a base and a phosphate of ribose or deoxyribose
— called also nucleoside phosphorylase
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