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Definition of: apparatus
(ap′ə·rā′təs, -rat′əs) noun plural ·tus or (rarely) ·tus·es
1. A complex device or machine for a particular purpose: an X-ray apparatus.
2. An integrated assembly of tools, appliances, instruments, etc., operating to achieve a specified result.
3. Physiol. Those organs and parts of the body by means of which natural processes are carried on: digestive apparatus. [<L, preparation <apparare make ready <ad- to + parare prepare]
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