dong quai 
(dng kwā, kwī)
(dng kwā, kwī)n.
A perennial aromatic herb (Angelica sinensis) in the parsley family, native to China and Japan, yielding a root that is used medicinally for gynecological disorders such as premenstrual syndrome, menstrual cramps, and menopausal symptoms.
[Mandarin dāng guī, from Middle Chinese taŋ kyj : taŋ, should, ought + kyj, return (from the belief that the plant causes blood to return where it should).]