calcium hydroxide
noun [ U ] chemistry specialized uk/ˌkæl.si.əm haɪˈdrɒk.saɪd/ us/ˌkæl.si.əm haɪˈdrɑːk.saɪd/
氢氧化钙，熟石灰（白色碱性化合物，用于制水泥，石膏或改良酸性土壤）
a white alkaline chemical compound used to make cement and plaster and to reduce acidity in soil
Synonym: lime