Definition of "ultrasound" []

• Ultrasonic sound. (noun)
• 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. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The unit is named after the physicist H. H.rtz and is abbreviated H.. Thus the following formula applies to the propagation velocity of the wave: C = fλ = 1/T * λ This equation (wave equation) applies to all wave processes. (ii) Definition of the term ultrasound The frequency of a sound impression (tone) is a direct measure for the pitch of a tone."
• "(Its cumulative, kids!) and the ultrasound is the only thing that ever showed the lump."
• "If the ultrasound is right and if the little nudger currently beating the crap out of my uterus is a boy, then I have to face this decision … to do or not to do?"