a board that resembles a broad ski or a small surfboard; used in a standing position to slide down snow-covered slopes
"The athlete strapped into his bindings and began to snowboard down the steep, powder-covered mountain."
A board, somewhat like a broad ski, or a very long skateboard with no wheels, used in the sport of snowboarding.
"He rented a snowboard to glide down the icy slope without touching his skis."
In plain English: A snowboard is a wide board with two bindings that you stand on to glide down snowy hills while holding onto poles for balance if needed.
"He bought a new snowboard to use on his first day at the resort."
Usage: Use this term to refer specifically to the equipment ridden on snow-covered slopes rather than general skateboards. It functions as both an uncountable mass noun when discussing the activity and a countable singular object when referring to individual boards owned by riders.
glide down a snow-covered slope while standing on a board
"The children love to snowboard in winter"
To ride a snowboard.
"He decided to snowboard down the mountain after packing his gear."
The word is a straightforward combination of "snow" and "board," describing equipment designed to glide over snowy surfaces like a skateboard does on pavement. It entered the English language as a descriptive term for this specific winter sport gear rather than evolving from an older, unrelated meaning.