motocross

American Heritage Dictionary:

mo·to·cross

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(mō'tō-krôs', -krŏs') pronunciation

n. (Abbr. MX)
A cross-country motorcycle race over a closed course of rough terrain with steep hills and sharp curves. Also called scramble.

[French moto-cross : moto, motorcycle (short for motocyclette , from moto-, motor , from moteur , from Latin mōtor, mover; see motor) + EnglishCROSS(-COUNTRY) .]

motocross

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Motocross racing (credit: Kinney Jones)

Form of motorcycle racing in which cyclists compete on a closed course marked out over natural or simulated rough terrain. Courses vary widely but must be 1.55 km (13 mi) in length, with steep inclines, hairpin turns, and mud. Motorcycles are grouped into classes according to engine displacement (e.g., 125-, 250-, 500-cc). It is probably the most physically demanding motorcycle sport.

For more information on motocross, visit Britannica.com.

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American Heritage Dictionary 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. Read