ultrasounds Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. High-frequency sound waves used for medical imaging or therapy. Example Sentence The doctor used ultrasounds to monitor the baby's development in the womb. Synonyms sonogram; echogram; doppler imaging Antonyms x-ray; MRI Hear It! Say It! Write It! ultrasounds Switch to cursive Start Share with your friends: