vestigial
/vesˈtɪdʒɪəl/adjective
1- forming a very small remnant of something that was once much larger or more noticeable残留的, 残余的; 遗留的：
he felt a vestigial flicker of anger from last night.
对昨晚的事他还觉得有一丝恼火。
1.1
- Biology (of an organ or part of the body) degenerate, rudimentary, or atrophied, having become functionless in the course of evolution【生】（器官, 身体部位）退化的, 发育不全的：
the vestigial wings of kiwis are entirely hidden.
几维鸟退化了的翅膀已完全看不见。
派生词