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a means of locating an object using an emitted sound and the reflection back from it.
Dolphins use echolocation to navigate and find prey. |
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a noninvasive technique that uses ultrasound to record the functioning of the heart.
Rosita's chest pains were so severe that an echocardiogram was necessary for diagnosis. |
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formed in imitation of some natural sound
Advertisements make good use of echoic phrases like "rice crispies snap, crackle, pop," to help consumers remember their products. |
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involuntary parrot-like repetition of a word or phrase just spoken by another; echoing
echolalia is often seen in autistic children. |
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free from echoes and reverberations
Stereo systems are tested in anechoic chambers which absorb all stray sounds. |
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the outerpart of the solid earth composed of rock
The thickness of the lithosphere varies considerably from about one mile to approximately eighty miles. |
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related to the early stone age
The stone implements characteristic of the Paleolithic period were typically roucg or chipped. |
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a genus of early man(comprising only the Piltdown man); dawn man
The discovery of the skull and jaw of Eoanthropus in England in 1908 was nothing more than a hoax. |
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a very early and crude stone tool
Geologists believe that the eolith was naturally formed and not of human design. |
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the process or method of printing from a metal or stone surface.
One typical style of lithography uses ink on a polished stone |
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relating to the sound epoch of the Tertiary period.
Many modern species of birds first appeared in the Eoscene Period. |
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