noun Cell Biology.
a small platelike body, especially a blood platelet.

1890–95; plate1 + -let Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
platelet (ˈpleɪtlɪt)
Formerly called: thrombocyte a minute cell occurring in the blood of vertebrates and involved in clotting of the blood
[C19: a small plate]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1895, formed in Eng. from plate (q.v.) + dim. suffix -let.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

platelet plate·let (plāt'lĭt)
A minute, irregularly shaped, disklike cytoplasmic body found in blood plasma that promotes blood clotting and has no definite nucleus, no DNA, and no hemoglobin. Also called blood platelet, thrombocyte.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
platelet   (plāt'lĭt)  Pronunciation Key 
Any of the numerous small, round cell fragments found in the blood of mammals that function in the clotting of blood. Platelets contain no nuclei and are formed in the bone marrow from precursor cells called megakaryocytes. Platelets contribute to the coagulation process by adhering to damaged blood vessels, fibrinogen, and other platelets. An inadequate number of platelets leads to uncontrolled bleeding.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
platelets [(playt-luhts)]

Small, flat disks in the blood that aid in clotting.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
So the mosquito is equipped with a powerful enzyme in her saliva to disable the
Then they inject the concentrated platelets at the site of the patient's injury.
Electron microscopy turned up no sign of the platelets that would normally
  gather in a clot.
The results are single-layer films composed of many platelets.
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