Washout may refer to: Washout (erosion), the erosion of a soft surface by a gush of water Washout (aeronautics), the practice of building a wing with a twist from root to tip Washout (comics), a mutant character in the Marvel Comics universe "Washout", a song by The Fallout Trust "Washout", a 1991 episode of the PBS show Shining Time Station "Washout", a story from The Railway Series book "Thomas Goes Home" Washed Out, the stage name of chillwave musician Ernest Greene The well drilling process for enlarging a drill hole in an oil well A term for a sporting event cancelled due to rain; see Rainout (sports) An alternate name for a run-in period, a common phase in clinical research Radiocontrast washout, where radiocontrast disappears from a tissue