| 释义 |
alkali/ˈælkəlai/n. (pl. alkalis) 1 Chem. any of a class of substances which neutralize acids and turn litmus blue, typically dissolving in water to form often caustic solutions with a pH of more than 7, containing free hydroxide ions; a soluble base 【化】碱，碱性物质 (pH 值大于 7 ，含有自由氢离子) 2 any soluble salt present in excess in the soil (土壤中大量存在的)可溶性无机盐 □ alkalimeter /ælkəˈlimitə/ n.□ alkalimetry /ælkəˈlimitri/ n.[Middle English, applied to a saline substance derived from the ashes of various plants: from medieval Latin, from Arabic al-kalī ‘calcined ashes’ of the glasswort etc., from kala ‘fry’] |