wye
/waɪ/noun
1- a support or other structure shaped like a Y, in particularY字形物, 尤指：
1.1
- N. Amer. a triangle of railway track, used for turning locomotives or trains〈北美〉（用于火车头或火车转向的）Y形铁轨, 三角形铁轨。
1.2
- (in plumbing) a short pipe with a branch joining it at an acute angle（管子工行业的）Y形管子。
词源
mid 19th cent.: the letter Y represented as a word.