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Pronunciation: li'so-som

Definition: A cytoplasmic membrane-bound vesicle measuring 5–8 nm (primary lysosome) and containing a wide variety of glycoprotein hydrolytic enzymes active at an acid pH; serves to digest exogenous material, such as bacteria, as well as effete organelles of the cells.

[lyso- + G. soma, body]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.