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| a means of locating an object using an emitted sound and the reflection 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 imitation of some natural sound |
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| involuntary parrot-like repition of a word or phrase |
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Definition
| free from echo and reverberations |
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Definition
| the outer part of the solid earth composed of rock |
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| a genus of early man (comprising only the piltdown man); drawn man |
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| a very early crude stone age tool |
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| the process or method of printing from a metal or shoe surface |
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Definition
| relating to the second epoch of the Tertiary period |
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