a support or other structure shaped like a Y, in particular Y字形物,尤指 ■(N. Amer.)a triangle of railway track, used for turning locomotives or trains (北美)Y形铁轨(用于火车头或火车转向的)三角形铁轨 ■(in plumbing) a short pipe with a branch joining it at an acute angle (管子工行业的)Y形管道
语源
mid 19th cent.: the letter Y represented as a word