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.
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

ribosome ri·bo·some (rī’bə-sōm’)
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.
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.
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.


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