noun1. 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. USa container of sand for small children to play in
British equivalent: sandpit 4. computinga protected environment in which an untrusted program may be run without affecting other parts of the system
5. a type of video game in which players can move freely through a virtual environment without fixed objectives