ribosome

[rahy-buh-sohm]
noun Cell Biology.
a tiny, somewhat mitten-shaped organelle occurring in great numbers in the cell cytoplasm either freely, in small clusters, or attached to the outer surfaces of endoplasmic reticula, and functioning as the site of protein manufacture.

Origin:
1955–60; ribo(se) + -some3

ribosomal, adjective
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World English Dictionary
ribosome (ˈraɪbəˌsəʊm)
 
n
any of numerous minute particles in the cytoplasm of cells, either free or attached to the endoplasmic reticulum, that contain RNA and protein and are the site of protein synthesis
 
[C20: from ribo(nucleic acid) + -some³]
 
ribo'somal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

ribosome
1958, coined by R.B. Roberts from ribo(nucleic acid) + -some "body."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ribosome ri·bo·some (rī'bə-sōm')
n.
A minute round cytoplasmic particle composed of RNA and protein that is the site of protein synthesis as directed by mRNA.


ri'bo·so'mal (-sō'məl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ribosome   (rī'bə-sōm')  Pronunciation Key 
A sphere-shaped structure within the cytoplasm of a cell that is composed of RNA and protein and is the site of protein synthesis. Ribosomes are free in the cytoplasm and often attached to the membrane of the endoplasmic reticulum. Ribosomes exist in both eukaryotic and prokaryotic cells. Plastids and mitochondria in eukaryotic cells have smaller ribosomes similar to those of prokaryotes. See more at cell.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
ribosome [(reye-buh-sohm)]

A small, ball-like structure in the cell, made of proteins and RNA molecules, that serves as a platform on which the cell's proteins are made.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Despite the fact that both chloramphenicol and doxycycline target the ribosome, no mutation to the ribosome was seen.
The ribosome mediates the formation of a polypeptide sequence based on the mrna sequence.
The ribosome translates a single protein from the viral genome.
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