1. a person who works to bring about political or social change and improvement
2. a device used in industrial processes to convert one chemical compound into another
Usage: technical; chemistry

Examples

• Martin Luther King Jr. was a famous civil rights reformer.
• The education reformer proposed changes to the school curriculum.
• Social reformers in the 19th century fought for workers’ rights.
• The prison reformer advocated for better conditions for inmates.
• The steam reformer converts natural gas into hydrogen.
• Political reformers called for transparency in government.