Any of several Mexican plants of the genus Dioscorea having a large,inedible root that yields an extract used as a raw material for synthetic steroid hormones.

• 苦皮，薯蓣一种薯蓣属墨西哥植物，有硕大而不可食的根部，可以产出一种抽提物，用作合成类固醇激素的原料。