Definition of BMX
: bicycle racing that resembles motocross with dirt tracks and jumps and the use of special heavy-duty bicycles
Origin of bmx
bicycle motocross + X as symbol for -cross
First Known Use: 1975
Learn More about bmx
Britannica.com: Encyclopedia article about "BMX"
Seen and Heard
What made you want to look up BMX? Please tell us where you read or heard it (including the quote, if possible).