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1. A rivulet; a brook.
2. A narrow channel or course, as for water.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) literary a small stream
[C16: from Old English rynele; related to run]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
also run•let(ˈrʌn lɪt)
1. a small stream; rivulet.
2. a small channel, as for water.
[1570–80; alter., by assimilation to run (n.), of rinel, Old English rynel(e), rinnele = rin-, base of run + -el -le]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.