海金砂 [－－－]

Jyutping hoi2 gam1 saa1
Pinyin hǎi jīn shā

Definitions (Wiktionary)
  1. noun
    spores of Lygodium japonicum (a medicinal substance used in traditional Chinese medicine to "induce diuresis and excrete dampness".
    (syn.) 海金沙