Pronunciation: (wī),[key] —n., —pl.wyes. 1. the letter Y, or something having a similar shape.
2. Elect.a three-phase, Y-shaped circuit arrangement.
3. Railroads.a track arrangement with three switches and three legs for reversing the direction of a train.
Pronunciation: (wī),[key] —n. a river flowing from central Wales through SW England into the Severn estuary. 130 mi. (210 km) long.