nu·cle·o·sid·ase noun \ˌn(y)ü-klē-ə-ˈsī-ˌdās, -ˌdāz\
: an enzyme that promotes the hydrolysis of a nucleoside
: 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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