"rivulet," 1570s, in Hakluyt, alteration of Middle English ryneil, from Old English rinelle, rynel, a diminutive of ryne "a stream" (from PIE root *rei- "to run, flow") with -el (2).
rundown
rune
rung
runic
run-in
runnel
runner
runner-up
running
runny
Runnymede
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