Sentence:  <WSD>Causticity</WSD> is that sharp and corroding quality, which many substances possess, such as the mineral acids, especially when concentrated, alkalies fixed and volatile, quicklime, arsenic, corrosive sublimate, lunar crystals, butter of antimony, and even most other salts with metallic bases. 
Meaning of the word marked with <WSD> tags:  The quality of being physically caustic; burning, corrosive.