- ultrasound - very high frequency sound; used in ultrasonography
--1 is a kind of sound
- sonography, ultrasonography, ultrasound - 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
--2 is a kind of imaging, tomography; prenatal diagnosis
- sonography, ultrasonography, ultrasound - 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