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[pleyt-lit] /ˈpleɪt lɪt/
noun, Cell Biology.
a small platelike body, especially a blood platelet.
Origin of platelet
First recorded in 1890-95; plate1 + -let Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for platelets


a minute cell occurring in the blood of vertebrates and involved in clotting of the blood Formerly called thrombocyte
Word Origin
C19: a small plate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for platelets



1895, formed in English from plate + diminutive suffix -let.

Online Etymology Dictionary, © 2010 Douglas Harper
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platelets in Medicine

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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platelets in Science
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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platelets in Culture
platelets [(playt-luhts)]

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

The 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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