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ribosome (n.)

1958, coined by U.S. microbiologist Richard B. Roberts (1910-1980) from ribo(nucleic acid) + -some "body" (see somato-). Related: Ribosomal.

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Definitions of ribosome from WordNet

ribosome (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;
the ribosome is the site of protein synthesis
From wordnet.princeton.edu