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        | a mean of locating an object using an emitted sound & the reflection back from it |  | 
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        | a noninvasive technique that uses the ultrasound to record the functioning of the heart |  | 
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        | formed in imitation of some natural sound |  | 
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 | Definition 
 
        | involuntary parrot-like repetition of a word or phrase just spoken by another; echoing |  | 
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 | Definition 
 
        | the outer part of the solid earth composed of rock |  | 
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 | Definition 
 
        | related to the early Stone Age |  | 
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 | Definition 
 
        | a genus of early man (comprising only the Piltdown man); dawn man |  | 
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 | Definition 
 
        | a very early & crude stone tool |  | 
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 | Definition 
 
        | the process or method of printing from a metal or stone surface |  | 
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 | Definition 
 
        | Relating to the second epoch of the Tertiary period |  | 
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