noun
1.
a. : a usually reinforced table with raised edges holding sand for children to mold
b. : a table bearing a relief model of a section of terrain built to scale of hardened sand that usually reproduces the contours, streams, trees, and buildings for the study of military tactics
2. : an inclined table used for concentrating ores that typically has the separating surface in motion and a continuous feed and discharge and that uses the motion to separate the ores into layers with the heavy material being shifted for further treatment