a small stream; streamlet; brook.

1580–90; earlier rivolet < Italian rivoletto, diminutive of rivolo < Latin rīvulus small stream

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World English Dictionary
rivulet (ˈrɪvjʊlɪt)
a small stream
[C16: from Italian rivoletto, from Latin rīvulus, from rīvus stream]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1587, from It. rivoletto, dim. of rivolo, itself a dim., from L. rivus "stream, brook," from PIE *reiwos, lit. "that which flows," from base *reie- "to flow, run" (see Rhine).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The helical strikes included on the surface of the cables do not significantly disrupt the rivulet path down the cable.
Potential migration or channeling of a liquid can from an elongated pool or rivulet of other sizes and shapes.
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