mo·to·cross 
(mōtō-krôs′, -krŏs′)
(mōtō-krôs′, -krŏs′)n.
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) + English CROSS(-COUNTRY).]