the swollen underground stem of a herb that grows in parts of Asia and is often used for adding fibre to food, or the herb itself

Konjac is a plant with various health claims attached to it. 魔芋是一种据说对健康有各种好处的植物。

The noodles are made out of konjac root, which is a natural fibre. 面条由魔芋根制成，是一种天然纤维。