rivulet
‘a small brook or stream’
Lexical development traced from the Tamil root:
E. riuulet < Ital. rivoletto < rivolo < rivo ‘brook’ < Lat. rivus ‘stream, brook’ + O.F. -elet (double-diminutive) < Lat. ellus + F. -et,-ette < O.F. –et < Vulgar Lat. -ittum / -itta < uht < -et < Tamil iṭṭu