1. a device that produces ions in the air, typically used to purify or freshen indoor air

Examples

• She bought an ionizer to reduce allergens in her bedroom.
• The office installed ionizers to improve air quality.
• Many people believe ionizers help them sleep better.
• The ionizer produces negative ions that attach to dust particles.
• He plugged in the small ionizer near his desk.
• The ionizer runs quietly in the background all day.