- The definition of a rivulet is a very small stream.
A little stream of water in your back yard that is about 2 feet deep and 2 feet wide and that runs over some rocks down to the lake at the base of a hill is an example of a rivulet.
Origin: earlier rivolet from Italian rivoletto, diminutive of rivolo, diminutive of rivo, stream from Classical Latin rivus, brook, stream: see rival
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Origin: Possibly from Italian rivoletto, diminutive of rivolo, small stream, from Latin rīvulus, diminutive of rīvus, stream; see rei- in Indo-European roots.