follow Dictionary.com

Today's Word of the Day means...

ribosome

[rahy-buh-sohm] /ˈraɪ bəˌsoʊm/
noun, Cell Biology
1.
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
1955-1960
1955-60; ribo(se) + -some3
Related forms
ribosomal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples for ribosomes
  • The root of my query is the fact that ribosomes must be incredibly complex molecules.
British Dictionary definitions for ribosomes

ribosome

/ˈraɪbəˌsəʊm/
noun
1.
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
Derived Forms
ribosomal, adjective
Word Origin
C20: from ribo(nucleic acid) + -some³
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for ribosomes
ribosome
1958, coined by R.B. Roberts from ribo(nucleic acid) + -some "body."
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
ribosomes in Medicine

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.
Cite This Source
ribosomes in Science
ribosome
  (rī'bə-sōm')   
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.
Cite This Source
ribosomes in Culture
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.
Cite This Source

Word of The Day

Difficulty index for ribosome

Many English speakers likely know this word

Word Value for ribosomes

13
15
Scrabble Words With Friends