Noun
deoxyribonuclease (plural deoxyribonucleases)
(biochemistry, genetics) Any of several enzymes that catalyze the cleavage of DNA.
Hershey and Chase showed that the introduction of deoxyribonuclease (referred to as DNase ), an enzyme that breaks down DNA, into a solution containing the labeled bacteriophages did not introduce any 32 P into the solution. Source: Internet
Then the remnants of the R strain bacteria were treated with a deoxyribonuclease enzyme which removed the DNA. Source: Internet