n.
A game similar to volleyball played on a four-walled court with a ball the same size as but harder than a volleyball that is allowed to bounce once off the ceiling or once off the walls before being returned over the net.
[Blend of WALL and VOLLEYBALL.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.