sandbox

[sand-boks]
noun
a box or receptacle for holding sand, especially one large enough for children to play in.

Origin:
1565–75; sand + box1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
sandbox (ˈsændˌbɒks)
 
n
1.  a container on a railway locomotive from which sand is released onto the rails to assist the traction
2.  a box with sand shaped for moulding metal
3.  a container of sand for small children to play in
4.  computing a protected environment in which an untrusted program may be run without affecting other parts of the system

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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FOLDOC
Computing Dictionary

sandbox definition


(UK: "sandpit")
1. A protected, limited environment where applications (e.g. Java programs downloaded from the Internet) are allowed to "play" without risking damage to the rest of the system.
2. A term for the R&D department at many software and computer companies (where hackers in commercial environments are likely to be found). The term is half-derisive, but reflects the truth that research is a form of creative play.
Compare playpen.
3. link farm.
[Jargon File]
(2001-02-08)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Finally, the emptied basin of what used to be a fountain had turned into something resembling a septic sandbox.
Determining data usage by the sandbox and other features.
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