石蕊 [－－]

Jyutping sek6 jeoi5
Pinyin shí ruǐ

Definitions (CC-CEDICT)
  1. reindeer moss
  2. litmus (chemistry)
Definitions (Wiktionary)
  1. noun
    litmus
  2. noun
    reindeer lichen (Cladonia rangiferina)