ˈn(y)üklēəˌsīˌdās noun
( -s )
Etymology: International Scientific Vocabulary nucleoside + -ase
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