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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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Definition
| formed in 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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Definition
| free from echos and reverberations |
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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 genus of early man comprising only the piltdown man, down man |
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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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