[rahy-boh-noo-klee-eys, -eyz, -nyoo-]
noun Biochemistry.
any of the class of enzymes that catalyze the hydrolysis of RNA.
Also called RNase, RNAase.

1940–45; ribonucle(ic acid) + -ase

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World English Dictionary
ribonuclease (ˌraɪbəʊˈnjuːkliːˌeɪs, -ˌeɪz)
any of a group of enzymes that catalyse the hydrolysis of RNA
[C20: from ribonucle(ic acid) + -ase]

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Medical Dictionary

ribonuclease ri·bo·nu·cle·ase (rī'bō-nōō'klē-ās', -āz', -nyōō'-)
Any of various enzymes that catalyze the hydrolysis of RNA. Also called RNase.

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