platelet

[pleyt-lit]
noun Cell Biology.
a small platelike body, especially a blood platelet.

Origin:
1890–95; plate1 + -let

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Collins
World English Dictionary
platelet (ˈpleɪtlɪt)
 
n
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
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Etymonline
Word Origin & History

platelet
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)
n.
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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Example sentences
These produce molecules called platelet-derived growth factors that are capable of switching on dormant follicles.
Red and white blood cell counts and platelet counts may be low.
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