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| a means of locating an object using an emitted sound that is reflected back from it. |
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| a noninvasive technique that uses ultrasound to record the functioning of the heart. |
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| formed in the imitation of some natural sound |
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| involuntary parrot-like repetition of a word or phrase just spoken by another; echoing |
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| free from echoes and reverberations |
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| a repetition of sound produced by the reflection of sound waves from a wall, mountain, or other obstructing surface. |
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| to put something out of its usual space |
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| the outer part of the solid earth composed of rock. |
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| related to the Early Stone Age |
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| a very early and crude stone tool |
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| the process or method of printing from a metal or stone surface |
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| relating to the second Epoch of the Tertiary period |
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