rill

Noun
  1. A small stream (synset 109438816)
    is a type of: stream, watercourse - a natural body of running water flowing on or under the earth
    same as: rivulet, run, runnel, streamlet
  2. A small channel (as one formed by soil erosion) (synset 109433338)
    is a type of: channel - a deep and relatively narrow body of water (as in a river or a harbor or a strait linking two larger bodies) that allows the best passage for vessels

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