Etymology
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platelet (n.)

"a little plate," originally and especially of the disk-shaped corpuscles in mammalian blood, 1895, formed in English from plate (n.) + diminutive suffix -let.

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Definitions of platelet

platelet (n.)
tiny bits of protoplasm found in vertebrate blood; essential for blood clotting;
Synonyms: blood platelet / thrombocyte
From wordnet.princeton.edu