ultrasound

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. very high frequency sound;
used in ultrasonography
• Derivationally related forms:
ultrasonic
• Hypernyms:
sound
2. using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram);
commonly used to observe fetal growth or study bodily organs
• Syn:
sonography, ultrasonography, echography
• Hypernyms:
imaging, tomography, prenatal diagnosis
• Hyponyms:
A-scan ultrasonography, B-scan ultrasonography