rillet

Etymology
From + either  or.

Noun

 * 1) A little rill.
 * 2) * 1953,,  (1971 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.
 * 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.