platelet
‘small plate or disk, especially a corpuscular structure of the blood; a minute, disk-like cytoplasmic body found in the blood plasma of mammals that promotes blood clotting’
Lexical development traced from the Tamil root:
plate + O.F. -elet (double-diminutive) < Lat. ellus + F. -et,-ette < O.F. –et < Vulgar Lat. -ittum / -itta < uht < -et < Tamil iṭṭu