1. A visible trace, evidence, or sign of something that once existed but exists or appears no more.
2. Biology. A rudimentary or degenerate, usually nonfunctioning, structure that is the remnant of an organ or part that was fully developed or functioning in a preceding generation or an earlier stage of development.
3. slang. A very small underdeveloped person. n.
4. slang. A younger or smaller version of oneself. n. or adj.