A fencer is someone who participates in the sport of fencing, or sword fighting. Fencers are among the athletes who compete in the Olympics every four years.
If you become a fencer, you'll learn all the rules and strategy behind dueling with rapiers or swords. Fencers wear special gear, including protective jackets, short pants, gloves, and masks. The word fencer comes from the verb fence, "defend oneself," from the noun fence, "fortification," a shortened form of defense.