Having or wearing a helmet, or looking like wearing a helmet.(adjective)
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Use "helmeted" in a sentence
"An arrest report for the helmeted bandit, who ran out of the Bellagio hotel-casino with $1.5 million in chips during a gunpoint heist Dec. 14, said Anthony M. Carleo lost about $105,000 at the resort over the next month – including $73,000 on New Year's Eve."
"He was limp when she touched him, his helmeted head lolling to the side."
"Getty Images New Zealand's Sonny Bill Williams (rugby) There's soccer, Australian rules football, Gaelic football and football football (the helmeted variety played in North America)."