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rivulet (n.)

"small stream or brook," 1580s, perhaps from Italian rivoletto, diminutive of rivolo, itself a diminutive of rivo "brook," from Latin rivus "stream, brook" (from PIE *reiwos "that which flows," from root *rei- "to run, flow"). For ending, see -let.

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Definitions of rivulet from WordNet

rivulet (n.)
a small stream;
Synonyms: rill / run / runnel / streamlet
From wordnet.princeton.edu