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| a means of locating an object using an object using an emitted sound and the reflection back from it |
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| a noninvasive techinque that uses ultrasoun to record the functioning og the heart |
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| formed in the imitation of some natural sound |
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| involuntary parrot-like repettion of a word or phrase just spoken but another;echoing |
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| 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,dawn man |
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| a very early abd crude stone tool |
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| the process or methos of printing from a metal or stone surface |
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| relating to the second epoch of the Teritary period |
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