Definition of runnel noun from the Oxford Advanced Learner's Dictionary

 

runnel

 noun
noun
BrE BrE//ˈrʌnl//
 
; NAmE NAmE//ˈrʌnl//
 
(formal or literary)
 
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a small stream or channel The tears made runnels down her make-up. the dark alleyways and runnels of the city Word Origin late 16th cent. (denoting a brook or rill): variant of dialect rindle, influenced by the verb run.
See the Oxford Advanced American Dictionary entry: runnel