Rill/rɪl/ Definition 1 of 2Pro Tip 1/3Natural Imagery Use 'rill' to create a vivid picture of a tranquil and natural setting in poetry or prose. Moonlight shimmered across the rill's gentle currents. Pro Tip 2/3Not a River 'Rill' indicates a stream that's smaller than a river, useful for describing delicate water bodies. A narrow rill snaked through the meadow. Pro Tip 3/3Sound Description When paired with words like 'babbling', it conveys the calming sounds made by small streams. We listened to the babbling rill as we picnicked.