noun
gromwell root; Lithospermum root
Specifically the root of Lithospermum erythrorhizon, used in traditional medicine and as a natural purple dye. The plant itself is ムラサキ.
See also: ムラサキ
紫根は漢方薬や紫色の染料として使われる。
Gromwell root is used in traditional Chinese medicine and as a purple dye.