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| relating to the second eopch of the Tertiary period |
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| very early and crude stone tool |
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| noninvasive technique that uses ultrasound to record the functioning of the heart |
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| means of locating an object using an emitted sound and the reflection back from it |
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| the outer part of the solid earth compsed of rock |
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| formed in imitatin of some natural sound |
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| process of printing from metal or stone surface |
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| involuntary parrot-like repitition of a word or phrase |
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| free from echoes and reverberations |
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