balliage
n.— «After rinsing the color out, Norika applied thin wisps of highlights throughout her hair using a technique called “balliage” (basically, just sweeping highlights through the hair in a natural way; no chunks of color here).» —“The Early Show: Hot Hair Trends For Fall: Bold” by David Evangelista CBS News Nov. 20, 2006. (source: Double-Tongued Dictionary)