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| involuntary parrot-like repetition of a word or phrase just spoken by another; echoing |
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| formed in imitation of some natural sound |
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| a noninvasive technique that uses ultrasound to record the functioning of the heart. |
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| a very early and crude stone tool |
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| a genus of early man(comprising only the Piltdown man); dawn man |
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| related to the early stone age |
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| the process or method of printing from a metal or stone surface. |
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| relating to the sound epoch of the Tertiary period. |
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| the outerpart of the solid earth composed of rock |
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| a means of locating an object using an emitted sound and the reflection back from it. |
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| free from echoes and reverberations |
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