Any of a large class of compounds, including the hydroxides and oxides of metals, having a bitter taste, a slippery solution, the ability to turn litmus blue, and the ability to react with acids to form salts.

• 碱，盐基一种有许多化合物的化学物，它含有金属氢氧化物和金属氧化物，带有苦味，溶液较滑，能使石蕊试纸变蓝，并能与酸反应生成盐