rillet

• ryllet [16th century]

rill (“small stream”, “brook”, “rivulet”) + either -et or -let

• enPR: rĭʹlĭt, IPA^(key): /ˈɹɪlɪt/

rillet (plural rillets)

1. A little rill.
   • Tennyson

     From the green rivage many a fall / Of diamond rillets musical.

   • 1953, Isaac Asimov, Second Foundation (1971 Panther Books Ltd publication), part II: “Search by the Foundation”, chapter 8: ‘Seldon’s Plan’, page 86, ¶ 1

     First, a pearly white, unrelieved, then a trace of faint darkness here and there, and finally, the fine neatly printed equations in black, with an occasional red hairline that wavered through the darker forest like a staggering rillet.

• Tiller, tiller