ultrasound

¹ul·tra·sound

noun \ˈəl-trə-ˌsau̇nd\

Definition of ULTRASOUND

1

: vibrations of the same physical nature as sound but with frequencies above the range of human hearing—compare infrasound

2

: the diagnostic or therapeutic use of ultrasound and especially a noninvasive technique involving the formation of a two-dimensional image used for the examination and measurement of internal body structures and the detection of bodily abnormalities—called also echography, sonography, ultrasonography

3

: a diagnostic examination using ultrasound