ultrasound

The use of very high sound waves to examine or treat parts inside the body.

• The doctor ordered an ultrasound.
• An ultrasound scan showed the baby moving.
• The therapist used ultrasound to treat her shoulder.

Common phrases: ultrasound scan, ultrasound treatment, have an ultrasound

Sound so high that human ears cannot hear it.

• Humans cannot hear ultrasound.
• Bats use ultrasound to find insects.
• The sensor sends out pulses of ultrasound.

Common phrases: emit ultrasound, ultrasound waves, ultrasound frequency