The width of a box is the horizontal distance from side to side (usually defined to be greater than the depth, the horizontal distance from front to back).
Width
See also
Depth, Distance, Height, Partial Order WidthExplore with Wolfram|Alpha
References
Eppstein, D. "Width, Diameter, and Geometric Inequalities." http://www.ics.uci.edu/~eppstein/junkyard/diam.html.Referenced on Wolfram|Alpha
WidthCite this as:
Weisstein, Eric W. "Width." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Width.html