plate·let

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

Origin:
1890–95; plate1 + -let

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
platelet (ˈpleɪtlɪt) [Click for IPA pronunciation guide]
 
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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00:10
Platelets is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a gadget; dingus; thingumbob.
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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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
Blood platelets stick to these tears and form a blood clot.
One function produces a substance that makes the tiny wound-plugging blood
  cells called platelets clump.
After a pint of blood is collected, it is processed into its transfusible
  components: plasma, platelets and red blood cells.
The growth of these bone tumors makes it harder for the bone marrow to make
  healthy blood cells and platelets.
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