[moh-toh-kraws, -kros]
a timed motorcycle race over a closed course consisting of a winding dirt trail with hills, jumps, sharp turns, and often muddy terrain.

< French: equivalent to moto(cycle) motorcycle + cross(-country) cross-country Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
motocross (ˈməʊtəˌkrɒs)
1.  a motorcycle race across very rough ground
2.  another name for rallycross See also autocross
[C20: from moto(r) + cross(-country)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

also moto-cross, by 1956, from motorcycle + cross-country.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The all-time winningest motocross rider's crash course in stock cars continued recently with a crash.
There are many privately owned and operated motocross tracks throughout the state.
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