noun
rivulet
RIV-yuh-lit/ˈrɪvjələt/
A small stream of water or other liquid.
A clear rivulet winds between grassy banks, revealing pebbles beneath the water.

Etymology
The stream root and smallness ending suggest a tiny brook. This analysis rests on a possible Italian double-diminutive origin, so that ancestry is not certain.
In context
It was a kind of small glen through which a rivulet flowed, but the banks were covered with a thick impenetrable undergrowth
More examples
- Rainwater runs down the driveway in narrow rivulets.
- A rivulet of sweat trickles down his forehead.
- The spilled juice forms a sticky rivulet across the counter.
Forms
rivulet · rivulets