ˈrən ə l noun
( -s )
Etymology: alteration (influenced by run ) (I), of earlier rinel, from Middle English, from Old English rynel, from the stem of rinnan to run, flow — more at run
1. : rivulet , brook , streamlet
2.
a. : the channel eroded by a small stream
b. : a small trough formed by wave or current action on a sea or lake bottom just offshore