runnel
/ˈrʌnəl/noun
1- a gutter沟; 水沟。
1.1
- a brook or rill小河, 小溪。
1.2
- a small stream of a particular liquid（液体的）细流：
a runnel of sweat.
一串汗珠。
词源
late 16th cent. (denoting a brook or rill)： variant of dialect rindle, influenced by the verb RUN.