World English Dictionary
exonuclease (ˌɛksəʊˈnjuːklɪˌeɪz)
Compare endonuclease an enzyme that is capable of detaching the terminal nucleotide from a nucleic acid chain

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American Heritage
Medical Dictionary

exonuclease ex·o·nu·cle·ase (ěk'sō-nōō'klē-ās', -āz', -nyōō'-)
Any of a group of enzymes that catalyze the hydrolysis of single nucleotides from the end of a DNA or RNA chain.

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