Source : Webster's Revised Unabridged Dictionary (1913)

Runlet \Run"let\, n. [Run + -let.]
   A little run or stream; a streamlet; a brook.

         To trace out to its marshy source every runlet that has
         cast in its tiny pitcherful with the rest. --Lowell.

Runlet \Run"let\, n.
   Same as {Rundlet}. ``A stoup of sack, or a runlet of
   canary.'' --Sir W. Scott.