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microparticle

Pronunciation: mi-kro-par'ti-kel

Definition:

  1. A very small particle, especially one that can pass through a filter of specified fineness.
  2. A vesicle, ranging in size from 5 to 100 mcm, released from the membrane of a cell into the circulation. Microparticles are immunologically unique to their cells of origin and may play a role in antigen presentation. Increased numbers of certain kinds of microparticle may be found in the circulation in vascular and thrombotic disorders.

[micro- + particle]

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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