• An RNA molecule that does not contain protein-coding sequence information and constitutes the majority of the cellular RNA (~80%). This nucleic acid associates with multiple proteins to form ribosomes, which are the organelles that drive mRNA-directed protein synthesis.
  NCI Thesaurus
  U.S. National Cancer Institute, 2021
• Most abundant form of RNA; together with proteins, it forms the ribosomes, playing a structural role and also a role in ribosomal binding of mRNA and tRNAs; individual chains are conventionally designated by their sedimentation coefficients; in eukaryotes, four large chains exist, synthesized in the nucleolus and constituting about 50 percent of the ribosome.
  CRISP Thesaurus
  National Institutes of Health, 2006
• (rna, ribosomal) The most abundant form of RNA. Together with proteins, it forms the ribosomes, playing a structural role and also a role in ribosomal binding of mRNA and tRNAs. Individual chains are conventionally designated by their sedimentation coefficients. In eukaryotes, four large chains exist, synthesized in the nucleolus and constituting about 50% of the ribosome. (Dorland, 28th ed)
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• Ribosomal RNA (rRNA), molecule in cells that forms part of the protein-synthesizing organelle known as a ribosome and that is exported to the cytoplasm to help translate the information in messenger RNA (mRNA) into protein. The three major types of RNA that occur in cells are rRNA, mRNA, and...
  Encyclopedia Britannica
  Encyclopedia Britannica, Inc., 2020