RACK (4)

Rack, n. [[Prob. fr. Icel. rek drift, motion, and akin to reka to drive, and E. wrack, wreck. √282.]] Thin, flying, broken clouds, or any portion of floating vapor in the sky. Shak. The winds in the upper region, which move the clouds above, which we call the rack, . . . pass without noise. Bacon. And the night rack came rolling up. C. Kingsley.