查询结果:

n. 酸味,酸性,酸度;尖刻性,酸辛性

拆分: -ac-尖,酸 + -id名词词尾 + -ity名词词尾,性质  

例:
Check the acidity of the soil with a test kit. 用试验器具测一下土壤的酸度。 
This plant prefers alkaline soil, though it will readily tolerate some acidity. 这种植物在酸性土壤中也能生存，但硷性土壤更加适宜。 
Acidity in soil can be neutralized by spreading lime on it. 土壤的酸性可以通过在它上面撒石灰来中和。