rivulet \RIV-yuh-lut\ (noun) - A small stream or brook; a streamlet.
"In this extremity, continuing his walk, he discovered a rivulet of the purest water, of which he copiously drank." -- Charles Swan, ' Gesta Romanorum'
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Rivulet is from Italian rivoletto, diminutive of rivolo, from Latin rivulus, diminutive of rivus, "a brook, a stream."