ribosome noun. ['rʌɪbǝsǝʊm] M20.
[from RIBONUCLEIC + -SOME³.]
Biology. Each of the ribonucleoprotein particles in the cytoplasm of living cells, free or attached to endoplasmic reticulum, which bind messenger RNA and transfer RNA to synthesize polypeptides and proteins.

■ ribosomal adjective of or pertaining to a ribosome;

■ ribosomal RNA, the RNA of a ribosome: M20.

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