noun Etymology: bicycle motocross + X as symbol for -cross Date: 1975 bicycle racing that resembles motocross with dirt tracks and jumps and the use of special heavy-duty bicycles
BMX
Meaning of BMX in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012