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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 repetition of a word or phrase just spoken by another; echoing |
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Definition
| Free from echoes 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); dawn 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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