1. sound waves with frequencies above the range of human hearing, typically above 20,000 Hz
Usage: technical
2. a medical imaging technique that uses high-frequency sound waves to create images of internal body structures
Usage: medical
3. an image or examination produced by ultrasound technology
Usage: medical

Examples

• Bats use ultrasound to navigate in the dark.
• The doctor ordered an ultrasound to check the baby’s development.
• Ultrasound waves can penetrate soft tissues but are reflected by bones.
• She had her first ultrasound at twelve weeks of pregnancy.
• The ultrasound showed that the baby was healthy.
• Dolphins communicate using ultrasound frequencies.
• The technician performed an ultrasound on her abdomen.
• Industrial cleaning often uses ultrasound to remove dirt and debris.