Etymology
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runnel (n.)

"rivulet, small stream of water," 1570s (Hakluyt), an alteration (by influence of run) of Middle English ryneil, from Old English rinelle, rynel, a diminutive with -el (2) + ryne "a stream" (see run (n.)).

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Definitions of runnel

runnel (n.)
a small stream;
Synonyms: rivulet / rill / run / streamlet
From wordnet.princeton.edu