Definition of ultrasound Ultrasound

/ʌˌltɹʌsawˈnd/ - [ultrusawnd] - ul•tra•sound

We found 7 definitions of ultrasound from 5 different sources.

What does ultrasound mean?

WordNet

Noun Plural: ultrasounds
ultrasound - very high frequency sound; used in ultrasonography
		sound the particular auditory effect produced by a given cause; "the sound of rain on the roof"; "the beautiful sound of music"
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
		sonography, ultrasonography, echography
		tomography, imaging (medicine) obtaining pictures of the interior of the body
		prenatal diagnosis any of the diagnostic procedures used to determine whether a fetus has a genetic abnormality
		a-scan ultrasonography the use of ultrasonography to measure the length of the eyeball

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Wiktionary

ultrasound (Noun)
sound with a frequency greater than the upper limit of human hearing; approximately 20 kilohertz.
ultrasound (Noun)
The use of ultrasonic waves for diagnostic or therapeutic purposes.

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ultrasound
Sound waves having a frequency above about 20,000 hertz.

Wikipedia

Ultrasound is a type of sound with a frequency bigger than humans can hear. This frequency, the 'upper-limit of human hearing,' is approximately 20,000 (hertz (20 kilohertz).

Ability to hear ultrasound.

Some animals, such as dogs, dolphins, bats, and mice, are able to hear sounds which have a frequency greater than upper-limit of the human ear. This makes them able to hear ultrasounds. Children can hear some high-pitched sounds that older adults cannot hear, as in humans the upper limit pitch of hearing gets lower as a person gets older. This frequency limit is caused by the middle ear that acts as a low-pass filter. If ultrasound is fed directly into the skull bone and reaches the cochlea without passing through the middle ear, much higher frequencies (up to about 200 kHz) can be heard. This effect (sometimes called ultrasonic hearing) was first discovered by divers exposed to a high-frequency (ca. 50 kHz) sonar signal.

Diagnostic sonography.

Medical sonography (ultrasonography) is a useful ultrasound-based diagnostic medical imaging technique used to see muscles, tendons, and many internal organs, their size, structure and any pathological lesions. They are also used to see foetuses during routine and emergency pre-birth care. Ultrasound scans are done by medical health care professionals called 'sonographers.' Obstetric sonography is commonly used during pregnancy. Ultrasound is generally thought of as a "safe test" because it does not use ionising (destructive) radiation