痕こん跡せき器き官かんこんせききかんMeanings1nounvestigial organ; rudimentary organA biological term for an organ that has lost most or all of its original function through evolution.ヒトの尾び骨こつは痕こん跡せき器き官かんの一いち例れいだ。The human coccyx is an example of a vestigial organ.
