茶垢

chágòu
tea stain (on the inside of a tea pot, tea cup etc)

CEDICT

茶具内壁的垢物，因长期容放茶水聚积而成。

維基詞典

Entry Composition

1 茶 chá
  1. tea
  2. tea plant

classifiers: 杯, 壺
2 垢 gòu
  1. dirt
  2. disgrace

Related entries

茶锈 cháxiù tea stain (on the inside of a tea pot, tea cup etc)