Vitriol (noun)

1. Sulfuric acid, a strong corrosive acid.
2. Speech or behavior that is bitter, cruel, or spiteful.

Origin:

From the latin word "vitriolum" meaning "sulfuric acid" or "a bitter or spiteful remark".

Examples:

1. The vitriol was used to clean the metal.
2. The vitriol burned through the fabric.
3. She unleashed a torrent of vitriol on her former friend.
4. The vitriol in his tone was unmistakable.
5. The audience was shocked by the vitriol in the speaker's words.