from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A minute round particle composed of RNA and protein that is found in the cytoplasm of living cells and serves as the site of assembly for polypeptides encoded by messenger RNA.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Small organelles found in all cells; involved in the production of proteins by translating messenger RNA.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an organelle in the cytoplasm of a living cell; they attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid; when it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell


ribo(nucleic acid) + -some3.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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