a segment of RNA that can act as a catalyst.

1985–90; ribo(some) + (en)zyme

ribozymal, adjective
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World English Dictionary
ribozyme (ˈraɪbəʊˌzaɪm)
an RNA molecule capable of catalysing a chemical reaction, usually the cleavage of another RNA molecule
[C20: from ribo(nucleic acid) + (en)zyme]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ribozyme ri·bo·zyme (rī'bə-zīm')
A strand of RNA that attaches to specific sites on other RNA strands and lyses the strands.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
If a transcription error affects certain parts of the ribozyme, further replication is impossible.
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