1. a person or thing that dilates or widens something
2. a medical instrument used to enlarge or open a body cavity or passage
Usage: medical
3. a muscle that causes expansion or widening of a body part
Usage: anatomy

Examples

• The pupil dilater is used in eye exams to help the doctor see the back of the eye.
• A nasal dilater can help improve airflow during sleep.
• The dilater muscle in the iris controls how much light enters the eye.
• Doctors use a cervical dilater during certain medical procedures.
• Heat acts as a blood vessel dilater, increasing circulation to the skin.