We don't have synonyms for cyclocross yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are cyclo-cross, cyclo cross and cyclotrons.
(n) :
(cycle racing) A form of bicycle racing consisting of many laps of a short course featuring pavement, wooded trails, grass, steep hills and obstacles and requiring the rider to quickly dismount, carry the bike whilst navigating the obstruction and remount in one motion.
(n) :
(cycle racing) A form of bicycle racing consisting of many laps of a short course featuring pavement, wooded trails, grass, steep hills and obstacles and requiring the rider to quickly dismount, carry the bike whilst navigating the obstruction and remount in one motion.