WordNet
n. a helmet worn by the batter in baseball
Wikipedia
A batting helmet is worn by batters in the game of baseball or softball. It is meant to protect the batter's head from errant pitches thrown by the pitcher. A batter who is " hit by pitch," due to an inadvertent wild pitch or a pitcher's purposeful attempt to hit him, may be seriously, even fatally, injured.
Usage examples of "batting helmet".
Once inside the dugout, he slings his batting helmet disgustedly under the bench.
Heller had to turn down a lot more than he bought: three pairs of shoes, six white, long-sleeved undershirts, twelve pairs of baseball socks with red-striped tops, two white exercise suits, a dozen support underpants, two unlettered uniforms that were white with red stripes, a red anorak with captain's stripes, a black belt and a red batting helmet.