Skip to Content
Medical Term:


Pronunciation: mi-kro-par'ti-kel


  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]

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