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单词 ultrasound
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WordReference Random House Learner's Dictionary of American English © 2024
ul•tra•sound /ˈʌltrəˌsaʊnd/USA pronunciation   n. [uncountable]
  1. Physicssound with a frequency greater than 20,000 Hz, close to the upper limit of human hearing.
  2. Medicinethe application of ultrasonic waves to methods of diagnois or of healing, as in deep-heat treatment of a joint.

WordReference Random House Unabridged Dictionary of American English © 2024
ul•tra•sound  (ul′trə sound′),USA pronunciation n. 
  1. Physicssound with a frequency greater than 20,000 Hz, approximately the upper limit of human hearing.
  2. Medicinethe application of ultrasonic waves to therapy or diagnostics, as in deep-heat treatment of a joint or imaging of internal structures. Cf. ultrasonography. 
  • ultra- + sound1 1920–25

Collins Concise English Dictionary © HarperCollins Publishers::
ultrasound /ˈʌltrəˌsaʊnd/ n
  1. ultrasonic waves at frequencies above the audible range (above about 20 kHz), used in cleaning metallic parts, echo sounding, medical diagnosis and therapy, etc
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更新时间：2025/2/22 21:51:53