1. a substance that makes someone or something more sensitive to a particular stimulus or condition
Usage: medical; chemistry
2. a chemical that increases the sensitivity of photographic materials to light
Usage: photography

Examples

• The doctor identified the plant as a skin sensitizer that caused the allergic reaction.
• Many people develop sensitivity to latex after repeated exposure to this common sensitizer.
• The photographer added a sensitizer to improve the film’s response to dim lighting.
• Chemical sensitizers in the workplace must be properly labeled and handled.
• Some fragrances contain sensitizers that can trigger contact dermatitis.
• The new employee received training on handling sensitizers safely in the lab.