Definitions

1. noun

A person who tempts or provokes someone into committing an error or sin.

“The destemper in the group goaded the others into vandalism.”

2. noun

A substance used to remove temper from metal, especially iron or steel, by removing the carbon content.

“The blacksmith applied a destemper to the steel before heating it in the furnace.”

3. verb

To deprive of temper; to remove the carbon content from (metal), especially iron or steel.

“The process of destempering the metal made it more malleable.”