资料来源 : pyDict

痕迹的,遗迹的,退化的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Vestigial \Ves*tig"i*al\, a.
   Of or pertaining to a vestige or remnant; like a vestige.

资料来源 : WordNet®

vestigial
     adj : not fully developed in mature animals; "rudimentary wings"
           [syn: {rudimentary}]