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See indoor soccer.
[Spanish and Portuguese futsal. Spanish, short for fúbol de salón : fúbol, soccer (from English football) + de, of + salón, hall, augmentative of sala, room (ultimately of Germanic origin). Portuguese, short for futebol de salão : futebol, soccer (from English football) + de, of + salão, hall, augmentative (perhaps modeled on French salon, room, salon) of sala, room (ultimately of Germanic origin).]
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.
(Soccer) a form of association football, played indoors with five players on each side
[C20: Spanish from futbol football + sala indoor]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014