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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Ball Games, other than specified) a ball game played on an indoor court
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
wal•ly•ball(ˈwɒl iˌbɔl, ˈwɔ li-)
a game similar to volleyball played in a walled court so that the ball may be bounced against the walls.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.