ul·tra·sound ( l tr -sound )n. 1. Ultrasonic sound. 2. Medicine The use of ultrasonic waves for diagnostic or therapeutic purposes, specifically to image an internal body structure, monitor a developing fetus, or generate localized deep heat to the tissues. |
ultrasound [ˈʌltrəˌsaʊnd]
n
(Physics / General Physics) ultrasonic waves at frequencies above the audible range (above about 20 kHz), used in cleaning metallic parts, echo sounding, medical diagnosis and therapy, etc.
| ultrasound (ltr-sound) 1. Sound whose frequency is above the upper limit of the range of human hearing (approximately 20 kilohertz). 2. See ultrasonography. 3. An image produced by ultrasonography. ultrasonic adjective ( ltr-s n k)A Closer Look Many people use simple ultrasound generators. Dog whistles, for example, produce tones that dogs can hear but that are too high to be heard by humans. Sound whose frequency is higher than the upper end of the normal range of human hearing (higher than about 20,000 hertz) is called ultrasound. (Sound at frequencies too low to be audible  about 20 hertz or loweris called infrasound.) Medical ultrasound images, such as those of a fetus in the womb, are made by directing ultrasonic waves into the body, where they bounce off internal organs and other objects and are reflected back to a detector. Ultrasound imaging, also known as ultrasonography, is particularly useful in conditions such as pregnancy, when x-rays can be harmful. Because ultrasonic waves have very short wavelengths, they interact with very small objects and thus provide images with high resolution. For this reason ultrasound is also used in some microscopes. Ultrasound can also be used to focus large amounts of energy into very small spaces by aiming multiple ultrasonic beams in such a way that the waves are in phase at one precise location, making it possible, for example, to break up kidney stones without surgical incision and without disturbing surrounding tissue. Ultrasound's industrial uses include measuring thicknesses of materials, testing for structural defects, welding, and aquatic sonar. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  ultrasound - very high frequency sound; used in ultrasonographysound - mechanical vibrations transmitted by an elastic medium; "falling trees make a sound in the forest even when no one is there to hear them" |
| 2. |  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 organsprenatal diagnosis - any of the diagnostic procedures used to determine whether a fetus has a genetic abnormality tomography, imaging - (medicine) obtaining pictures of the interior of the body A-scan ultrasonography - the use of ultrasonography to measure the length of the eyeball B-scan ultrasonography - the use of ultrasonography to view structure in the back of the eye |
Translations
n ultrasound [altresaund]
ultrasonic sound, used especially in scanners, that can show what is inside a person's body. ultraklank فَوق الصَّوْتي свръхзвук ultrazvuk ultralyd der Ultraschall υπέρηχος ultrasonido ultraheli امواج فرا صوتی ultrason אוּלטרָה-סָאוּנד अल्ट्रा-साउंड ultrazvuk ultrahang ultrasuono 초음파 ultragarsas ultraskaņa ultrabunyi ultrasound ultralyd ultradźwięk ультразвук ultrazvuk ultrazvok ultrazvuk ultraljud คลื่นเสียงที่มีความถี่มากกว่า 20,000 เฮิรตซ์; การบำบัดโดยใช้อุลตราซาวด์ işitim ötesi ses 超音波 ультразвук الٹرا ساؤنڈ، بدن کے اندر ديکھنے کي مشين sóng siêu âm 超频率音响
ultrasound → موجات فوق صوتية ultrazvuk ultralyd Ultraschall υπέρηχος ecografía ultraääni échographie ultrazvuk ecografia 超音波 초음파 ultrasone klank ultralyd ultradźwięk ultra-som ультразвук ultraljud การบำบัดโดยใช้อุลตราซาวด์ ultrason sóng siêu âm 超频率音响
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