Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Supercross" Definition
noun
A sport in which high-performance off-road motorcycles are raced on an artificially made dirt track consisting of steep jumps and obstacles.
Source: Wiktionary
A motorcycle race held in a stadium on a dirt track having hairpin turns and high jumps.
Source: Merriam-Webster
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