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Wiktionary
oligonucleotidase

n. (context enzyme English) Any enzyme that catalyses the hydrolysis of an oligonucleotide, but especially an exoribonuclease derived from ''Flammulina velutipes''.

Wikipedia
Oligonucleotidase

Oligonucleotidase (, oligoribonuclease) is an exoribonuclease derived from Flammulina velutipes. This enzyme catalyses the following chemical reaction

3'-end directed exonucleolytic cleavage of viral RNA-DNA hybrid